Lesson 3 (M3) & (M5) - How atoms differ & the periodic table

Question 1

What is an atomic number?

Answer 1

The amount of protons in an atom.

Question 2

Atomic number = ?

Answer 2

= number of protons
= number of electrons

Question 3

Isotopes

Answer 3

Atoms with the same number of protons but different number of neutrons.

Question 4

What do groups 1-2, and 13-18 have?

Answer 4

Representative elements.

Question 5

What are group 3-12?

Answer 5

Transition metals.

Question 6

Metal properties

Answer 6

Shiny, smooth, solid at room temperature, and good conductors of heat and electricity.

Question 7

Alkali metals

Answer 7

Group 1 (in exception of hydrogen), very reactive.

Question 8

Alkaline metals

Answer 8

Group 2, are highly reactive but moderate when compared to group 1.

Question 9

Non-metal properties

Answer 9

Gases or brittle, dull-looking solids. They are poor conductors of heat and electricity.

Question 10

Group 17

Answer 10

Highly reactive, called halogens.

Question 11

Group 18

Answer 11

Extremely unreactive. Commonly called Noble gases.

Question 12

Metalloid properties

Answer 12

Metalloids have properties of both metals and non-metals.

Question 13

What is an Ion?

Answer 13

An atom or molecule that has an electric charge

(either positive or negative)

Question 14

What is Ionization energy?

Answer 14

Ionization energy measures the tendency of an atom to resist the loss of its valence electron

Question 15

The octet rule states that

Answer 15

Atoms lose, share, or gain electrons to acquire a full set of valence electrons

Question 16

Electronegativity is

Answer 16

a measure of an atom’s ability to attract shared electrons to itself