Atomic Structure

What subatomic particle/s would you find in the nucleus of an atom?

• Protons only

• Protons and neutrons

• Electrons and protons

• Electrons and neutrons

The mass of an atom is due to the ____?

• Protons and electrons

• Protons and neutrons

• Electrons and neutrons

• Electrons only

What element has 20 protons, 21 neutrons and 20 electrons?

• Calcium

• Niobium

• Scandium

• Zirconium

What is the difference between atomic mass and mass number?

• The atomic mass have decimals because it is the weighted average of all its isotopes.

• The mass number is always a whole number because it is the sum of the protons and neutrons.

• All of the above

• None of the above

Which of the subatomic particles balance the charge of an atom?

• Protons and electrons

• Protons and neutrons

• Electrons and neutrons

• Protons, electrons and neutrons

Protons are the identification (ID) of an atom. What atom has 55 protons?

• Cesium

• Iron

• Manganese

• Xenon

Chlorine atom has an atomic number of 17 and a mass number of 35. How many protons are in the atom?

• 35

• 17

• 18

• 52

Chlorine atom has an atomic number of 17 and a mass number of 35. How many neutrons are in the atom?

• 35

• 17

• 18

• 52

Chlorine atom has an atomic number of 17 and a mass number of 35. How many electrons are in the atom?

• 35

• 17

• 18

• 52

An atom has 13 protons. How many of another subatomic particle must it have so that it will be neutral?

• 13 neutrons

• 13 electrons

• 26 neutrons

• 26 electrons