Advanced Chemistry S1 Final Review

In which of the following sets is the symbol of the element, the number of protons, and the number of

electrons given correctly?

• In, 49 protons, 49 electrons

• Zn, 30 protons, 60 electrons

• Cs, 55 protons, 132.9 electrons

• F, 19 protons, 19 electrons

What element has the electron configuration 1s ² 2s² 2p ⁶ 3s² 3p ² ?

• Nitrogen

• Selenium

• Silicon

• Silver

Which of the following statements is true about ions?

• Cations form when an atom gains electrons.

• Cations form when an atom loses electrons.

• Anions form when an atom gains protons.

• Anions form when an atom loses protons

How many valence electrons are in an atom of phosphorus?

• 2

• 3

• 4

• 5

How many valence electrons are in an atom of magnesium?

• 2

• 3

• 4

• 5

What is the name given to the electrons in the highest occupied energy level of an atom?

• orbital electrons

• valence electrons

• anions

• cations

What is the electron configuration of the calcium ion?

• 1s ² 2s ² 2p⁶ 3s ² 3p⁶

• 1s ² 2s ² 2p⁶ 3s ² 3p⁴ 4s²

• 1s ² 2s ² 2p⁶ 3s ² 3p⁵ 4s¹

• 1s ² 2s ² 2p⁶ 3s ²

What is the formula of the ion formed when potassium achieves noble-gas electron configuration?

• K²⁺

• K⁺

• K^1-

• K^2-

Which of the following elements does NOT form an ion with a charge of 1+ ?

• fluorine

• hydrogen

• potassium

• sodium

How many electrons does nitrogen gain in order to achieve a noble-gas electron configuration?

• 1

• 2

• 3

• 4