Atomic Structure (2) 22-23

An element with a mass number of 10 and an atomic number of 6 has how many protons?

• 5
• 8
• 6
• 10

How many protons, electrons and neutrons does an neutral atom of Calcium have?  Its atomic number is 20 and the mass number is 40.

• 20 protons, 18 electrons and 40 neutrons
• 20 protons, 20 electrons and 20 neutrons
• 40 protons, 40 electrons and 20 neutrons
• 20 protons, 18 electrons and 20 neutrons

Neutrons have almost exactly the same mass as

• electrons.

• positrons.

• protons.

• quarks.

What is the lightest subatomic particle?

• atom

• electron

• proton

• neutron

Oxygen’s atomic number is 8. This means that an oxygen atom must have

• 8 electrons
• 8 protons
• 8 neutrons
• a mass number of 8

An atom is said to be neutral if it has same number of electrons and...…..

• electrons

• protons

• neutrons

• ions

The subatomic particle has almost no mass is.....................

• proton

• electron

• neutron

• no correct answer

Which two subatomic particles make up the nucleus of an atom?

• Protons and Electrons
• Neutrons and Electrons
• Electrons and Protons
• Protons and Neutrons

At what part of the atom is the arrow pointing?

• nucleus

• energy level

• electron

• proton

Value representing the number of protons in an element

• Atomic Mass
• Mass Number
• Valence Electrons
• Atomic Number