2.3 Review

Atomic Number

100

Hydrogen is the most abundant element in the universe. The atomic number of hydrogen is:

1

200

Another important element is carbon, found in all organic molecules. How many protons are in an atom of carbon?

6

300

How many electrons does Oxygen^2-  have?

10

400

70% of air is nitrogen. Ionized nitrogen produces green and violet aurora colors. Do you know its atomic number?

7

500

Fluorine is the first halogen. Pure fluorine is a corrosive yellow gas. Do you know its atomic number?

9

Ion

100

Meals are likely gain or lose electrons?

Lose

200

A negatively charged ion is one that has more protons than electrons? True or False.

False.

300

What is the ionic form of Sulfur?

S^2-

400

If the oxygen ion is to return to the oxygen atom, it must gain or lose two electrons?

Lose

500

Why would an element/atom loses or gains an electron?

Being stable.

Atomic Mass

100

What is the atomic mass of hydrogen? 

1.0

200

How do you calculate the atomic mass of an element?

Add the # of protons with the # of neutrons.

300

What is the atomic mass of oxygen? 

16.0

400

The majority of the atomic mass is in ____?

Nucleus

500

An element which atomic mass = 28.1, number of protons = 14, what is the number of neutrons?

14

Miscellaneous

100

What element has 4 energy levels and 1 valence electrons?

K

200

What are the horizontal rows on the periodic table called?

periods

300

What would be the formula for a compound between potassium and nitrogen?

Hint: COMPOUND requires the positive and negative charges to add up to equal zero.

K₃N

400

What would be the chemical formula for a compound between aluminum and oxygen?

Hint: COMPOUND requires the positive and negative charges to add up to equal zero.

Al₂O₃

500

Which one has a large atomic size? 

P or Ca?

Ca

Trends

100

How many energy levels does fluorine have?

2

200

How many valence electrons does aluminum have?

3

300

What is the periodic trend for energy levels? How do energy levels change across the periodic table?

They increase going down the periodic table

400

What is the periodic trend for valence electrons?  How does the number of valence electrons change from left to right?

Valence electrons increase from left to right

500

List 3 metals that have similar reactivity to calcium.

Be, Mg, Sr, Ba, Ra