U2 Atoms and the Periodic Table Test Review

Marla creates a model of atoms. The atoms exhibit similar properties but they do not have the same mass number. Which BEST describes the atoms in Marla's model?

• The atoms are ions.

• The atoms are isotopes.

• The atoms have different numbers of protons.

• The atoms have different numbers of electrons.

Tags

NGSS.MS-PS1-1

The table shows the characteristics of four elements. Which element has the highest atomic number? (Use a periodic Table!)

• Sulfur

• Strontium

• Silver

• Sodium

Directions: The table shows information about the states of the elements copper, hydrogen, boron, and mercury at room temperature. Use the table to answer any questions that follow. An unknown substance is colorless and has a very low density. This unknown substance could be which element?

• copper

• hydrogen

• mercury

• boron

Use the diagram of the three atoms to answer any questions that follow. How many protons are in atom II? (Hint: It is neutral)

• 0

• 3

• 11

• 12

A box from the periodic table for the element carbon (C) is shown below. Use the information in the box to answer any questions that follow. What is the atomic number of carbon?

• 6

• 12

• 14

• 16

How many electrons are in one neutral atom of carbon?

• 6

• 5

• 7

• 8

How many protons are in a neutral carbon atom?

• 6

• 5

• 7

• 8

The number of electrons in a neutral carbon (C) atom ...

• can be determined by adding the atomic number to the atomic mass.

• can be determined by dividing the atomic mass by the atomic number.

• is equal to the number of protons in carbon (C).

• is equal to the mass number of carbon (C).

Which letter is used to identify an atom?

• C is used because it does not vary in atoms of the same element.

• D is used because it does not vary in atoms of the same element.

• E is used because it represents the number of neutrons in an atom.

• C is used because it represents the number of electrons in an atom.

A neutral atom of the element potassium (K) has

• 19 protons.

• 20 electrons.

• 39 protons.

• 58 neutrons.

Tags

NGSS.MS-PS1-1