the basic unit of a chemical element.

the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.

the mutual sharing of one or more pairs of electrons between two atoms.

a chemical bond in which two pairs of electrons are shared between two atoms.

a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.

the tendency of an atom participating in a covalent bond to attract the bonding electrons.

a substance that cannot be broken down into simpler components by any non-nuclear chemical reaction.

the outside part of an atom around the atomic nucleus

a weak bond between two molecules resulting from an electrostatic attraction between a proton in one molecule and an electronegative atom in the other.

an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.

a chemical bond formed between oppositely charged species because of their mutual electrostatic attraction.

any of two or more species of atoms of a chemical element with the same atomic number and nearly identical chemical behavior but with differing atomic mass or mass number and different physical properties.

anything that occupies space and has mass

a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.

a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.

Nonpolar covalent bond

a type of chemical bond that is formed when electrons are shared equally between two atoms. The covalent bond is also termed as nonpolar because the difference in electronegativity is mostly negligible.

the electrons are shared unequally, as one atom exerts a stronger force of attraction on the electrons than the other. The ability of an atom to attract a pair of electrons in a chemical bond is called its electronegativity.

a molecule in which one end of the molecule is slightly positive, while the other end is slightly negative.

a subatomic particle found in the nucleus of every atom. The particle has a positive electrical charge, equal and opposite to that of the electron.

An unstable form of a chemical element that releases radiation as it breaks down and becomes more stable.

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Ilana Biology Quiz 2

Term	Definition
Atom	the basic unit of a chemical element.
Atomic Number	the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
Covalent Bond	the mutual sharing of one or more pairs of electrons between two atoms.
Double Bond	a chemical bond in which two pairs of electrons are shared between two atoms.
Electron	a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
Electronegativity	the tendency of an atom participating in a covalent bond to attract the bonding electrons.
Element	a substance that cannot be broken down into simpler components by any non-nuclear chemical reaction.
Electron Shell	the outside part of an atom around the atomic nucleus
Hydrogen bond	a weak bond between two molecules resulting from an electrostatic attraction between a proton in one molecule and an electronegative atom in the other.
Ion	an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
Ionic bond	a chemical bond formed between oppositely charged species because of their mutual electrostatic attraction.
Isotope	any of two or more species of atoms of a chemical element with the same atomic number and nearly identical chemical behavior but with differing atomic mass or mass number and different physical properties.
Matter	anything that occupies space and has mass
Molecule	a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
Nucleus	the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.
Neutron	a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
Nonpolar covalent bond	a type of chemical bond that is formed when electrons are shared equally between two atoms. The covalent bond is also termed as nonpolar because the difference in electronegativity is mostly negligible.
Polar covalent bond	the electrons are shared unequally, as one atom exerts a stronger force of attraction on the electrons than the other. The ability of an atom to attract a pair of electrons in a chemical bond is called its electronegativity.
Polar molecule	a molecule in which one end of the molecule is slightly positive, while the other end is slightly negative.
Proton	a subatomic particle found in the nucleus of every atom. The particle has a positive electrical charge, equal and opposite to that of the electron.
Radioactive isotope	An unstable form of a chemical element that releases radiation as it breaks down and becomes more stable.

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