1.
A positively charged subatomic particle found in the nucleus of an atom. It determines the element's atomic number.
2.
A neutral subatomic particle found in the nucleus of an atom. It contributes to the atom's mass but has no charge.
3.
A negatively charged subatomic particle that orbits the nucleus of an atom. It determines the atom's chemical properties.
4.
The number of protons in the nucleus of an atom, which defines the element.
5.
The total number of protons and neutrons in the nucleus of an atom.
6.
Atoms of the same element1 with different numbers of neutrons, resulting in different mass numbers.
7.
An atom that has gained or lost electrons, resulting in a net positive or negative charge.
8.
The energy change that occurs when an atom gains an electron.
9.
The reduction in the attraction between the nucleus and valence electrons due to the presence of inner electrons.
10.
The measure of an atom's ability to attract electrons from another atom in a chemical bond.
11.
The distance from the nucleus to the outermost electrons of an atom.
12.
The energy required to remove an electron from an atom.
13.
The outermost electrons of an atom, involved in chemical bonding.
14.
Energy levels surrounding the nucleus where electrons are located.
15.
The tendency of atoms to gain, lose, or share electrons to achieve a stable electron configuration of eight valence electrons.
16.
Visual representations of electron configurations showing the arrangement of electrons in orbitals.
17.
The distribution of electrons among the orbitals of an atom.
18.
Regions of space around the nucleus where electrons are likely to be found.
19.
Different energy levels within an electron shell, designated as s, p, d, and f.
20.
A tabular arrangement of elements organized by atomic number and electron configuration, revealing periodic trends.
