Question 1

the number of protons

Accepted Answer

atomic number

Question 2

the sum of protons and neutrons

Accepted Answer

atomic mass

Question 3

same number of protons but different number of neutrons

Accepted Answer

isotope

Question 4

Vertical column on the periodic table

Accepted Answer

group

Question 5

center of an atom

Accepted Answer

nucleus

Question 6

where electrons are found in an atom

Accepted Answer

electron cloud

Question 7

2 subatomic particles found in the nucleus of an atom

Accepted Answer

protons and neutrons

Question 8

2 subatomic particles in equal amounts to be a neutral atom

Accepted Answer

protons and electrons

Question 9

Change in the number of protons

Accepted Answer

different element

Question 10

Horizontal row on the periodic table

Accepted Answer

period

Question 11

arrangement of elements on first periodic table

Accepted Answer

increasing atomic mass

Question 12

arrangement of elements on current periodic table

Accepted Answer

increasing atomic number

Question 13

positively charged subatomic particle

Accepted Answer

proton

Question 14

subatomic particle with no charge (neutral)

Accepted Answer

neutron

Question 15

negatively charged subatomic particle

Accepted Answer

electron

Question 16

building blocks of all matter

Accepted Answer

atom

Question 17

a chart of all the known elements (118)

Accepted Answer

periodic table

Question 18

same number of protons but different number of electrons [now a charged particle]

Accepted Answer

ion

Question 19

the mass unit of 1/12th of 1 Carbon-12 atom

Accepted Answer

atomic mass unit (amu)

Question 20

blocks on the periodic table

Accepted Answer

s, p, d, f

Question 21

most of the elements on the periodic table are this

Accepted Answer

metals

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