Unit 2 Electrons and Atomic Structure

The modern periodic table has the elements arranged in order of increasing__

• Atomic Mass
• Atomic Number
• Atomic charge
• Atomic symbol

Answer explanation

Elements in the same group (vertical column) have the same number of:

• valence electrons
• shells
• protons
• neutrons

Answer explanation

Elements in the same period (horizontal row) have the same number of:

• valence electrons

• electron shells/energy levels

• protons

• neutrons

Answer explanation

What is an ion?

• An atom with a different number of electrons

• An atom with a different number of protons

• An atom with a different number of neutrons

• An atom with a different number of energy shells

• An atom with a different quantum number

Answer explanation

Which of the following describes a noble gas?

• Has an even number of valence electrons

• Has a full valence layer

• Any of the 7 diatomic elements

• Has equal number of protons and neutrons

Answer explanation

Why do we study the Big Bang in chemistry class?

• All elements were made in the Big Bang

• All light was made in the Big Bang

• Because the temperatures at the Big Bang were immense

• That's where all hydrogen atoms came from and other atoms were made out of hydrogen atoms

Answer explanation

Hydrogen and Helium were made in the Big Bang. Lithium through Iron are made in stars through fusion. Cobalt through Uranium are made in supernovas. Elements after Uranium are synthetic and made by humans.

Which is the correct Lewis dot for C?

• D

• E

• F

• G

• H

Answer explanation

The frequency of a photon controls the:

• color

• quantum number

• configuration

• amplitude

Answer explanation

If this atom becomes an ion, what will it do?

• lose 4 electrons

• gain 8 electrons

• gain 2 electrons

• lose 2 electrons

Answer explanation

It has 6 valence electrons. It wants 8. Therefore it has to steal 2 electrons.

Which of the following is the most correct model of the atom?

• 
• 
• 
• 
• 

Answer explanation