Chem (Set 1)

Question 2

The number “23” in the picture below, is sodium’s __________.

Answer 2

Mass number

Question 3

True or False?

Each atomic symbol (element symbol) has one and only one capital letter.

Answer 3

TRUE

Question 5

Period trend

Answer 5

The gradual change of any property in the elements across a period in the periodic table.

Question 6

Elements in purple on the right

Answer 6

Noble gases

Question 8

Reverse Card

0

Answer 8

The charge of a neutron.

Question 11

Reverse Card

+1

Answer 11

The charge of a proton.

Question 12

Reverse Card

Two atoms with the same atomic number, but different atomic masses.

Answer 12

isotopes

Question 14

What is the charge of a proton?

Answer 14

+1

Question 15

Relative Atomic Mass

Answer 15

An average of all the different atomic masses of all the atoms of a chemical element.

(Remember, a chemical element can have isotopes that have different masses)

Many periodic tables use the term “Atomic Weight” for Relative Atomic Mass.

Question 16

ALL atoms of iron have EXACTLY 26 protons. Some atoms of iron, however, have 29 neutrons, while others have 30 neutrons.

We would call these two different versions of the iron atom ______________.

Answer 16

Isotopes