Science Vocab

1

100

Electrons in the outer-most energy level that participate in bonding (Same group=same # of valence electrons)

Valence Electrons

200

A charged particle (caution-positive, anion-negative)

Ion

300

rows on the periodic table, elements have the same number of energy levels

Periods

400

(families) columns on the periodic table, elements have the same number of valence electrons

Groups

500

two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei

Isotopes

2

100

refers to how likely or vigorously an atom is to react with other substances

Reactivity

200

Protons + Neutrons, a decimal on the periodic table because it's an average of different isotopes

Atomic Mass

300

Protons have a charge of _____?

+1

400

Neutrons have a charge of ____?

0

500

Electrons have a charge of _____?

-1

3

100

The nucleus is made up of _______ and ________?

Protons and Neutrons

200

Atoms have the same number of _______ and ________?

Protons and Electrons