Periodic Table (SI)

What is oxygen's atomic number?

• 8
• O
• 15.994
• 6A

How many protons are in one atom of sodium (Na)?

• 11
• 7
• 22
• 1

An unknown atom has 32 protons. What is the unknown atom?

• germanium (Ge)
• sodium (Na)
• carbon (C)
• sulfur (S)

How many protons are in the nucleus of calcium (Ca)?

• 20
• 10
• 40
• 40.08

How many protons are in one atom of potassium (K)?

• 19
• 18
• 38
• 1

What is the average atomic mass of fluorine?

• 18.9984 a.m.u
• 7A a.m.u
• 12.011 a.m.u
• 9 a.m.u

All atoms of a specific element have the same number of _______.

• protons
• electrons
• neutrons
• ions

Which element on the periodic table contains 11 protons?

• sodium
• boron
• aluminum
• copper

Which of the following elements has the greatest atomic mass?

• phosphorus
• nitrogen
• silicon
• lithium

Mercury is an element. Which of the following would be the same for all atoms of mercury?

• the number of protons
• the total number of protons and neutrons
• the number of electrons
• the number of neutrons