Topic 2- Atomic Structure and Periodic Table

Identify this element:

• Bromine

• Chlorine

• Argon

• Sulfur

How many neutrons does ¹⁴C have?

• 6

• 8

• 12

• 14

How many electrons does Fe⁺³ have?

• 23

• 26

• 29

• 56

Using the spectral lines of hydrogen as evidence, Bohr concluded that

• neutrons were located in the nucleus

• electrons could be located anywhere outside of the nucleus of an atom

• protons had positive charge

• electrons could only be in definite energy levels (like rungs of a ladder)

Which of the following could represent Ca in an excited state?

• 1s²2s²2p⁶3s²3p⁶4s²

• 1s²2s²2p⁶3s²3p⁶4s²3d⁸

• 1s²2s²2p⁶3s²3p⁴4s⁴

• 1s²2s²2p⁶3s²3p⁶4s¹3d¹

The noble gas configuration for Iodine is:

• [Xe]5s²4d¹⁰5p⁵

• [Kr]5s²4d¹⁰5p⁵

• [Kr]4d¹⁰5s²p⁴

• [Te]5p¹

Mg⁺² is isoelectronic with which element?

• Ne

• Ar

• Si

• Na

The atomic radius decreases as you go from left to right across a period because:

• The energy level of the valence electrons stays the same and nuclear charge decreases

• The energy level of the valence electrons stays the same and nuclear charge increases

• The energy level of the valence electrons increases, but nuclear charge increases as well

• The energy level of the valence electrons decreases and nuclear charge increases

Which of the following has 3 valence electrons?

• C

• Si

• Ga

• Li

An element that easily loses an electron has:

• low ionization energy

• high ionization energy

• high electronegativity

• none of the above