Atomic Theory and Electron Configuration

What is the chemical symbol for an element with 35 protons, 45 neutrons, and 36 electrons?

• Br

• Br⁺¹⁰

• Br^-1

• Kr

Which of the pairs listed below are isotopes?

• Na and Na⁺¹

• F^-1 and F

• 6¹⁴C and 6¹²C

• Ar and Kr

What is the charge of an ion with 17 protons, 16 neutrons, and 18 electrons?

• 0

• +1

• -1

• +9

How many neutrons are in ²⁰²₈₀Hg^+2?

• 80

• 202

• 122

• 78

What element contains 6 protons, 8 neutrons, and 6 electrons?

• C

• N

• Mg

• Si

What is the mass number of ²⁰²₈₀Hg^+2?

• 80

• 202

• 122

• 78

What is the mass number of an element with 12 protons, 12 neutrons, and 10 electrons?

• 2

• 12

• 22

• 24

The maximum number of electrons in an orbital in the p sublevel is

• 2

• 6

• 10

• 14

The element with electron configuration 1s²2s²2p⁶3s² is

• carbon

• sulfur

• magnesium

• silicon

What is the electron configuration for nitrogen?

• 1s²2s²2p³

• 1s²2s¹2p¹

• 1s²2s¹2p²

• 1s²2s²2p²3s¹