Atomic Structure Quiz

What makes atoms of different elements distinct from each other?

• The number of valence electrons

• The number of neutrons

• The number of protons

• The number of electrons

What does the atomic number of an element represent?

• The total number of protons

• The total number of valence electrons

• The total number of neutrons

• The total number of electrons

Which symbol is used to represent the atomic number?

• X

• N

• Z

• A

How is the atomic mass or mass number of an atom calculated?

• By adding the number of neutrons and electrons

• By adding the number of protons and electrons

• By adding the number of protons and neutrons

• By adding the number of protons, neutrons, and electrons

What is the mass number of a helium atom with 2 protons and 2 neutrons?

• 2

• 4

• 6

• 8

Why is the mass of electrons ignored in atomic mass calculations?

• Because electrons have a negative charge

• Because electrons are too small to count

• Because electrons have a negligible mass

• Because electrons are not present in the nucleus

In the symbolic representation of an atom, what does 'A' stand for?

• Mass number

• Atomic number

• Number of electrons

• Number of neutrons

How many neutrons are present in a chlorine atom with a mass number of 35 and an atomic number of 17?

• 17

• 18

• 20

• 19

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

• Protons are always more than electrons

• Electrons are always more than protons

• They are unrelated

• They are equal

How do you calculate the number of neutrons in an atom?

• Add the number of protons and electrons

• Add the atomic number and mass number

• Subtract the number of electrons from the atomic number

• Subtract the atomic number from the mass number