Unit 1A Check On Learning

Which property is different in isotopes of the same element?

• Number of neutrons

• Number of protons

• Number of electrons

• Atomic number

What is the atomic number of an element?

• The number of protons in an atom

• The number of neutrons in an atom

• The number of electrons in an atom

• The sum of protons and neutrons

What does the atomic number of an element represent?

• The number of electrons in an element

• The number of protons in an element

• The number of neutrons in an element

• The atomic mass of an element

What is the atomic number of oxygen?

• 6

• 7

• 8

• 9

Which of the following statements is true about atomic numbers?

• They can be fractions

• They are always whole numbers

• They are always even numbers

• They are always odd numbers

How is the atomic number related to the nucleus of an atom?

• It is the number of electrons in the nucleus

• It is the number of protons in the nucleus

• It is the number of neutrons in the nucleus

• It is the total number of particles in the nucleus

Tags

NGSS.HS-PS1-8

Which of the following elements has an atomic number of 8?

• Helium

• Oxygen

• Lithium

• Beryllium

What is true for neutral elements regarding protons and electrons?

• The number of protons is greater than the number of electrons.

• The number of protons is less than the number of electrons.

• The number of protons equals the number of electrons.

• The number of protons and electrons are unrelated.

What is the role of electrons in determining the atomic number?

• Electrons determine the atomic number.

• Electrons have no role in the atomic number.

• Electrons are equal to the atomic number in a neutral atom.

• Electrons are double the atomic number.

What is the atomic mass of Sulfur?

• 54.94

• 9.01

• 32.06

• 83.80