Unit 5 Post Test Atom and the Periodic Table

Select the correct locations on the periodic table. Which two elements have similar characteristics?

• Hydrogen and Helium

• Sodium and Potassium

• Carbon and Oxygen

• Magnesium and Chlorine

In the periodic table of elements, what do all of the elements in group 2 have in common?

• An atom of each element can hold up to eight electrons in its outer energy level.

• An atom of each element can hold up to six electrons in its outer energy level.

• Each element is an alkaline earth metal.

• Each element is a halogen.

• Each element is dull, brittle, and breaks easily.

The image shows a portion of the periodic table. Which two elements have similar characteristics?

• neon and fluorine

• chlorine and sulfur

• fluorine and chlorine

• oxygen and chlorine

• argon and fluorine

Which atomic model proposed that electrons move in specific orbits around the nucleus of an atom?

• Dalton’s atomic model

• Thomson’s atomic model

• Rutherford’s atomic model

• Bohr’s atomic model

• quantum atomic model

Which types of orbitals are found in the principal energy level n = 3?

• s, d

• s, p, d

• s, p

• s, p, f

• s, d, f

An element has atomic number 10 and an atomic mass of 20. How many neutrons are in the atom of this element?

• 10

• 20

• 30

• 0

• 200

Tags

NGSS.MS-PS1-1

Which particles make up the nucleus of an atom?

• protons and electrons

• neutrons and electrons

• protons only

• protons and neutrons

• neutrons only

An element has 8 protons and 8 neutrons in its nucleus and 8 electrons revolving around the nucleus. What is the atomic number and atomic mass of this element?

• The atomic number is 16 and the atomic mass is 8.

• The atomic number is 8 and the atomic mass is 8.

• The atomic number is 8 and the atomic mass is 16.

• The atomic number is 16 and the atomic mass is 4.

• The atomic number is 4 and the atomic mass is 16.

Tags

NGSS.MS-PS1-1

Which option describes a similarity and a difference between isotopes of an element?

• same atomic number; different number of protons

• same number of protons; different atomic number

• same atomic number; different mass number

• same mass number; different atomic number

• same number of neutrons; same number of protons

Which is a factor in determining the average atomic mass of an element?

• atomic number of the most abundant isotope

• relative abundance of each isotope

• sum of atomic masses of all isotopes

• product of atomic masses of all isotopes

• arithmetic mean of atomic masses of the isotopes