Periodic Table of Elements/ATOMS

What is the atomic number of Hydrogen?

• 1

• 2

• 3

• 4

How many protons does Hydrogen have?

• 1

• 2

• 3

• 4

How many protons does Oxygen have?

• 5

• 6

• 7

• 8

How many protons does Sodium have?

• 9

• 10

• 11

• 12

Oxygen's atomic mass is 15.999 - round this number.

• 14

• 15

• 16

• 17

Boron's atomic mass is 10.81 - this number rounded is ______

• 9

• 10

• 11

• 12

Nitrogen's atomic mass is 14.007 - what is this number rounded to?

• 13

• 14

• 15

• 15.5

What does the symbol "H" stand for?

• Help

• Hydrogen

• Helium

• Howard

Aluminum's atomic mass is 26.982 - what is this number rounded?

• 26

• 26.982

• 27

• 27.1

Magnesium's atomic mass is 24.305 - what is this number rounded to?

• 23

• 24

• 24.3

• 25