Question 1

List of all elements currently known

Accepted Answer

Periodic Table

Question 2

A pure substance made of only one kind of atom (118)

Accepted Answer

Element

Question 3

Subatomic particle with positive charge

Accepted Answer

Proton

Question 4

Subatomic particle with a negative charge

Accepted Answer

Electron

Question 5

Subatomic particle with no charge

Accepted Answer

Neutron

Question 6

sum of protons and neutrons (weighted average)

Accepted Answer

Atomic Mass

Question 7

the number of protons in the nucleus of an atom

Accepted Answer

Atomic Number

Question 8

change in the number of protons

Accepted Answer

Different element

Question 9

change in the number of neutrons

Accepted Answer

Isotope

Question 10

change in the number of electrons (now charged)

Accepted Answer

Ion

Question 11

These 2 subatomic particles are in equal numbers when atom is neutral

Accepted Answer

protons and electrons

Question 12

These 2 subatomic particles are found in the nucleus

Accepted Answer

protons and neutrons

Question 13

Vertical column in the periodic table

Accepted Answer

Group

Question 14

horizontal row in the periodic table

Accepted Answer

Period

Question 15

the number of periods on periodic table

Accepted Answer

7

Question 16

the number of groups on periodic table

Accepted Answer

18

Question 17

location of electrons in atom

Accepted Answer

electron cloud

Question 18

Created the first periodic table. Arranged elements by increasing atomic mass

Accepted Answer

Mendeleev

Question 19

Group 1

Accepted Answer

Alkali metals

Question 20

Group 2

Accepted Answer

Alkali earth metals

Question 21

Group 17

Accepted Answer

Halogens

Question 22

Group 18

Accepted Answer

Noble Gases

Question 23

blocks on periodic table

Accepted Answer

s, p , d , f

Question 24

have properties of both metals and nonmetals ; aka semi-conductors

Accepted Answer

metalloids

Question 25

usually solids, shiny, ductile, malleable , good conductors of heat and electricity

Accepted Answer

metals

Question 26

usually gases, dull, brittle, poor conductors of heat and electricity

Accepted Answer

non-metals

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