Practice for Atoms and Mixtures Test

What subatomic particles would you find in the nucleus of an atom?

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

What subatomic particle is electrically neutral (no charge)?

• Proton
• Ion
• Neutron
• Electron

The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

Parts of the atom that determine the identity of the atom (what kind of atom it is)

• Protons

• Neutrons

• Electrons

An atom with atomic number 6 would have how many protons?

• 6

• 12

• 3

• cannot be determined

An atom is made up mostly of _________.

• protons

• gravity

• empty space

• electricity

Answer explanation

Remember when we made ourselves into a human He atom outside? How far the first electrons and energy level was from the 4 people who made up the Nucleus of P + N !! The next ring would be just as far away from the first one and the third would be just as far from the second one etc...

Isotopes of the same element must have a different number of what subatomic particle?

(look at the picture to help)

• neutrons

• protons

• both neutrons and protons

• electrons

Answer explanation

Almost All elements have "Isotopes" "Heavier" versions of the element's atoms because they have more Neutrons. Neutrons add weight without changing it electrically. A Heavier, unbalanced nucleus makes the atom more unstable. Each isotope makes up a certain % of the element overall. This is why the atomic mass is an average weight of all of the isotopes of an element.

Which subatomic particles contribute the most to the mass of an atom?

• Protons, Neutrons, Electrons
• Protons only
• Protons and Electrons
• Protons and Neutrons

In an element box, the number at top is the

• atomic number

• atomic name

• atomic mass

• atomic symbol

The chemical symbol in this element box is

• 26

• Fe

• Iron

• 55.845