Atomic Structure+Periodic Table

Question 1

Atom

Answer 1

The smallest unit of matter that has the properties of an element

Question 2

Proton

Answer 2

Positively charged subatomic particle in the nucleus (+1)

Question 3

Neutron

Answer 3

Neutral subatomic particle in the nucleus (0)

Question 4

Electron

Answer 4

Negatively charged subatomic particle outside the nucleus (-1)

Question 5

Nucleus

Answer 5

Center of an atom, has protons + neutrons

Question 6

Atomic number

Answer 6

Number of protons in an atom, identifies the atom

Question 7

Mass number

Answer 7

The number of protons+ neutrons

Question 8

Group

Answer 8

Column on the periodic table, has the same number of valance electrons

Question 9

Period

Answer 9

Row on the periodic table

Question 10

Valence electrons

Answer 10

Electrons in the outermost energy shell. They determine reactivity.