Understanding Atomic Structure

What is the atomic number of nitrogen, and what does it signify?

• 7, which indicates the number of neutrons

• 7, which indicates the number of protons

• 14, which indicates the number of electrons

• 14, which indicates the number of protons

How many valence electrons does nitrogen have?

• 3

• 5

• 7

• 1

What is the mass number of sodium-20, and how is it used to find the number of neutrons?

• 20, add the atomic number to it

• 11, subtract the atomic number from it

• 11, add the atomic number to it

• 20, subtract the atomic number from it

How many valence electrons does sodium have?

• 2

• 1

• 4

• 3

What does a negative charge on selenium indicate about its electrons?

• It has no electrons

• It has more electrons than protons

• It has fewer electrons than protons

• It has an equal number of electrons and protons

How many valence electrons does selenium have when it has a charge of -2?

• 4

• 8

• 2

• 6

If carbon has a charge of -3, how many total electrons does it have?

• 3

• 9

• 6

• 12

How many valence electrons does carbon have when it has a charge of -3?

• 6

• 3

• 7

• 4

What is the total number of neutrons in silver-87?

• 40

• 34

• 47

• 87

Why can't the number of valence electrons in transition metals be predicted easily?

• They have a fixed number of valence electrons

• Their valence electrons vary widely

• Their valence electrons are always the same as their atomic number

• They have no valence electrons