Unit 2 (Atoms, Elements, and Atomic Mass)

Question 1

Microscopic particles that compose all matter

Answer 1

Atoms

Question 2

Positively charged Sub-atomic Particle

Answer 2

Proton

Question 3

Neutral charged Sub-atomic Particle

Answer 3

Neutron

Question 4

Negatively charged Sub-atomic Particle

Answer 4

Electron

Question 5

Determined by the number of protons in an atom’s nucleus

Answer 5

Atomic Number

Seen as subscript next to an element’s symbol

Question 6

Atoms with the same number or protons but a different number of neutrons

Answer 6

Isotopes

Isotopes have the same atomic number but a different mass number

Question 7

The sum of protons and neutrons in an atom

Answer 7

Mass Number

Seen as superscript next to an element’s symbol

Question 8

An atom in which the number of neutrons is equal to the number of protons

Answer 8

Neutral Atom

Question 9

Positively charged ion

Answer 9

Cation

Question 10

Negatively charged ion

Answer 10

Anion

Question 11

An atom or group of atoms that has a net positive or negative charge

Answer 11

Ion

Only the number of electrons change in Ions

Question 12

What is Avogadro’s number?

Answer 12

6.022 x 10^23

1 mol of something is 6.022 x 10^23 units of that thing

Question 13

The mass of 1 mol of atoms

Answer 13

Molar Mass

Found in the Periodic Table directly under the element symbol

Question 14

How do you convert between the number of atoms/molecules and the number of moles?

Answer 14

Avogadro’s Number

Question 15

How do you convert between the number of moles and mass in grams?

Answer 15

Molar Mass