1.
relative mass of all isotopes of a particular element, it is not a whole number as it into account the abundance of each.
2.
An atom that has gained at least one electron to form a negative ion.
3.
The smallest unit of matter that retains the properties of an element.
4.
the number of protons in an atom which identifies the element.
5.
Rule stating that electrons fill the lowest-energy orbitals first.
6.
A chemical equation where the number of atoms of each element is the same on both sides.
7.
An atom that has lost at least one electron to form a positive ion.
8.
Representation of a chemical reaction using symbols and formulas.
9.
Representation of a substance using symbols for elements and numbers for the ratio of atoms.
10.
A reaction where a substance reacts with oxygen to form carbon dioxide and water.
11.
Structure containing non-metals held together by sharing of electrons (covalent bond)
12.
A reaction where one compound breaks down into simpler substances.
13.
A reaction where two compounds exchange ions to form two new compounds.
14.
Negatively charged subatomic particle that occupies space outside the nucleus.
15.
atoms with the same number of protons
16.
The main region around the nucleus where electrons are likely to be found, designated by n.
17.
Observable changes such as color change, gas formation, precipitate, or energy change.
18.
columns going down the periodic table
19.
Electrons occupy orbitals singly before pairing up.
20.
An atom or group of atoms that has gained or lost electrons and carries a charge.
21.
Made up of oppositely charged ions held together in a lattice
22.
atoms of the same element with different number of neutrons
23.
the number of protons and neutrons in an atom, it is always a whole number
24.
two or more atoms bonded together
25.
Neutral subatomic particle found in the nucleus of an atom.
26.
The dense central region of an atom containing protons and neutrons (nucleons).
27.
A region in space with a high probability of finding an electron.
28.
Dumbbell-shaped orbitals (px, py, pz) found in higher energy levels.
29.
Two electrons occupying the same orbital must have different spins.
30.
rows that go across on the periodic table
31.
A substance formed as a result of a chemical reaction.
32.
Positively charged subatomic particle found in the nucleus of an atom.
33.
A substance that undergoes change in a chemical reaction.
34.
A spherical orbital found in all energy levels.
35.
A reaction where one element replaces another in a compound.
36.
Divisions of energy levels (s, p, d, f) with different shapes and capacities.
37.
A reaction in which two or more substances combine to form one product.
38.
Outer most shell that is occupied by electrons.
