Otis Singleton
Atoms are the smallest unit of matter that can exist without releasing electrically charged particles. They are made up of three subatomic particles: protons, neutrons, and electrons. Protons are positively charged, neutrons are neutral, and electrons are negatively charged. An atom becomes electrically neutral when it has an equal number of protons and electrons, resulting in a balanced charge with no overall charge. This balance is essential for the stability of the atom.
| Characteristics | Values |
|---|---|
| Overall charge | None |
| Protons | Positively charged |
| Neutrons | No charge |
| Electrons | Negatively charged |
| Number of protons | Equal to the number of electrons |
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What You'll Learn
- Protons, neutrons, and electrons are the three subatomic particles that make up an atom
- Protons are positively charged, neutrons are neutral, and electrons are negatively charged
- Atoms have an equal number of protons and electrons, resulting in a balanced charge
- The positive and negative charges of subatomic particles are of equal strength
- Ordinary atoms that gain or lose electrons are called ions
Protons, neutrons, and electrons are the three subatomic particles that make up an atom
An atom is made up of three subatomic particles: protons, neutrons, and electrons. Protons carry a positive charge and are located in the nucleus of the atom, which is a small, dense area at the center. Neutrons, on the other hand, are electrically neutral and are also found in the nucleus. The mass of an atom is mostly concentrated in this central nucleus, which consists of nucleons, which are protons and neutrons.
Electrons, the third type of subatomic particle, carry a negative charge and are located outside of the nucleus. They surround the nucleus in what is known as an electron cloud, where they are more or less likely to be found in certain areas. These negatively charged electrons account for most of the size of the atom, despite being almost massless.
The number of protons, neutrons, and electrons in an atom can vary across different elements. For example, the argon element has 18 protons and electrons, and 22 neutrons. Meanwhile, an atom with a charge of +1, a mass number of 6, and 3 protons will have 6 electrons because of its neutral charge, and 8 neutrons.
The atomic number, or proton number, refers to the number of protons present in an atom, and this determines the element. For instance, the element with an atomic number of 6 is carbon. Protons were discovered by Ernest Rutherford in 1919 through his gold foil experiment, while electrons were discovered by Sir John Joseph Thomson in 1897 through experiments with cathode rays.
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Protons are positively charged, neutrons are neutral, and electrons are negatively charged
Atoms are made up of protons, neutrons, and electrons. Protons are positively charged, neutrons are neutral, and electrons are negatively charged. This is due to the property of 'charge', which causes electrons to move in a particular way when entering magnetic or electric fields. The strength and direction of this property are equal and opposite to those of protons, leading to the definition of positive or negative charge.
Protons and electrons have equal but opposite charges, so their charges cancel each other out when they are balanced in an atom, resulting in a neutral atom. Neutrons, with no charge, do not impact the atom's overall charge. However, they do contribute to the atom's mass, making up most of it.
The charges of protons and electrons are defined as positive and negative, respectively, based on their properties and behaviour in electric and magnetic fields. The choice of labels 'positive' and 'negative' is simply a matter of convention, chosen to work with existing definitions.
In the case of anti-matter, the charges are reversed. Anti-protons have a charge of -1, while anti-neutrons have a charge of 0, just like regular neutrons. The classification of particles into matter and anti-matter may seem arbitrary, but there is an underlying rule. Quarks, electrons, and neutrinos are all fermions, which come in families or generations. The up quark, part of the same family as the down quark and electron, has a positive charge of +2/3, while the down quark has a negative charge of -1/3.
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Atoms have an equal number of protons and electrons, resulting in a balanced charge
Atoms are composed of three subatomic particles: protons, electrons, and neutrons. Protons are positively charged particles, electrons are negatively charged, and neutrons are electrically neutral. An atom is electrically neutral when it has no overall charge.
The protons and neutrons form the atom's central nucleus, while the electrons circle the nucleus in orbital paths called shells. The number of electrons in these shells determines an element's chemical behaviour. Each shell can only hold a certain number of electrons, and when a shell is full, the electrons start filling up the next one.
The number of protons in the nucleus of an atom defines its atomic number and determines its place in the periodic table. For example, an atom with an atomic number of 6 is carbon, while one with an atomic number of 92 is uranium.
Atoms can become charged particles, or ions, if they gain or lose electrons. If a neutral atom loses an electron, it becomes a positively charged ion. Conversely, if it gains an electron, it becomes a negatively charged ion.
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The positive and negative charges of subatomic particles are of equal strength
Atoms are composed of three subatomic particles: protons, neutrons, and electrons. Protons are positively charged particles, neutrons are neutral, and electrons are negatively charged. The positive and negative charges of these subatomic particles are of equal strength. This means that an atom with an equal number of protons and electrons is electrically neutral, with no overall charge.
The protons and neutrons form the atom's central nucleus, while the electrons circle the nucleus in orbital paths called shells. The number of electrons in each shell is limited. The atom's nucleus is small and dense compared to the electrons, which are the lightest charged particles in nature.
The positive and negative charges of subatomic particles balance each other out in an electrically neutral atom. This balance is due to the equal number of protons and electrons. Protons and electrons have equal but opposite charges, so when the number of each is equal, the charges cancel each other out, resulting in a neutral atom.
However, not all atoms remain electrically neutral. Some atoms lose or gain electrons during chemical reactions or collisions with other particles. When a neutral atom loses an electron, it becomes a positive ion, and when it gains an electron, it becomes a negative ion. These ions have an imbalance of charges, either positive or negative, depending on the number of protons and electrons present.
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Ordinary atoms that gain or lose electrons are called ions
The process of gaining or losing electrons helps atoms achieve a more stable electron configuration, often fulfilling the octet rule, which states that atoms are most stable with eight electrons in their outermost shell. This is critical in the formation of ionic bonds, where oppositely charged ions attract each other, leading to the formation of ionic compounds, such as sodium chloride (NaCl), commonly known as table salt. For instance, sodium (Na) loses one electron to form Na+, and chlorine (Cl) gains one electron to form Cl-. Together, these ions can combine to form NaCl, illustrating how ions interact chemically.
The concept of cations and anions and the role of electron transfer in ion formation is widely accepted in chemistry. The cation produced in this way, Na+, is called the sodium ion to distinguish it from the element. The outermost shell of the sodium ion is the second electron shell, which has eight electrons in it, satisfying the octet rule. On the left, a neutral sodium atom has 11 electrons. On the right, the sodium ion only has 10 electrons and a 1+ charge.
The health of cells depends on maintaining the proper levels of ions in intracellular fluids. Any change that affects the normal flow of ions across cell membranes could cause an organism to die. Molecules that facilitate the transport of metal ions across membranes are called ionophores. Streptomyces bacteria make valinomycin, a potent antibiotic that can kill or inhibit the growth of bacteria, as an ionophore to defend themselves against competing bacteria.
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Frequently asked questions
An atom becomes electrically neutral when it has an equal number of protons and electrons. Protons are positively charged, electrons are negatively charged, and as their charges cancel each other out, the atom has no overall charge and is therefore electrically neutral.
Protons, neutrons, and electrons are the three subatomic particles that make up an atom. Protons are positively charged, neutrons are neutral, and electrons are negatively charged.
An atom that is not neutral, i.e., has an unequal number of protons and electrons, is called an ion. If a neutral atom loses an electron, it becomes a positive ion, and if it gains an electron, it becomes a negative ion.
The atomic number, denoted by the letter Z, represents the number of protons (positively charged particles) in the atom's nucleus. This number determines the atom's position on the periodic table, as each chemical element is defined by the number of protons in its atoms.
