ATOMS: Atomic Number Quiz

What is the atomic number of hydrogen?

• 3

• 4

• 2

• 1

What is the atomic number of carbon?

• 6

• 30

• 20

• 12

How many protons are there in an atom with atomic number 20?

• 20

• 40

• 30

• 10

Tags

NGSS.MS-PS1-1

What is the atomic number of oxygen?

• 8

• 4

• 32

• 16

What is the atomic number of iron?

• 15

• 30

• 26

• 20

What is the atomic number of uranium?

• 92

• 105

• 56

• 78

How does the atomic number of an element change as you move across a period in the periodic table?

• Remains the same

• Decreases by one

• Increases by one

• Doubles

Explain the significance of the atomic number in determining the identity of an element.

• It indicates the number of electrons in the atom

• It determines the mass of the atom

• It helps in identifying the number of protons in the nucleus of an atom.

• It is used to calculate the atomic weight of the element

What is the relationship between the atomic number and the number of electrons in a neutral atom?

• The atomic number is equal to the number of electrons in a neutral atom.

• The atomic number is double the number of electrons in a neutral atom.

• The atomic number is unrelated to the number of electrons in a neutral atom.

• The atomic number is half the number of electrons in a neutral atom.

How is the atomic number related to the position of an element in the periodic table?

• The atomic number determines the position of an element in the periodic table.

• The position of an element in the periodic table is determined by its number of electrons.

• The position of an element in the periodic table is determined by its mass number.

• The atomic number has no relation to the position of an element in the periodic table.