Atomic Structure - 1

What is the centre core of the atom called?

The nucleus of an atom

• is positively charged

• is negatively charged

• has no charged particles

• has both positively and negatively charged particles

What is the number of electrons in an atom of neon?

• 10

• 7

• 23

• 100

What two particles are found in the nucleus?

• proton and neutron

• neutron and electron

• proton and electron

Why are atoms neutral in charge?

• They have equal number of protons and neutrons.

• They have equal number of protons and electrons.

• They have equal number of electrons and neutrons.

• They have equal number of protons, neutrons and electrons.

True or False:

Electrons are found in the energy shells of an atom.

• True

• False

How many protons does an oxygen atom have?

• 5

• 6

• 7

• 8

Answer explanation

Remember, the atomic number of an element is equal to the number of electrons an atom of that element has.

You can find the atomic number of every element using the periodic table.

How many protons does this atom have?

• 11

• 23

• 12

• 34

The number at the top left is the....

• Atomic Number

• Number of protons in the atom

• mass number

• number of electrons

What element is the atom shown?

(The red spheres in the atom are the protons.)

• Hydrogen

• Lithium

• Beryllium

• Carbon