Pretest C-202

What is the primary composition of an atom?

• mostly empty space.

• solid matter.

• a combination of different substances.

Which subatomic particle has a positive charge?

• Electron

• Neutron

• Proton

Which subatomic particle has no charge?

• Proton

• Neutron

• Electron

Electrons are found in

• the nucleus.

• the electron cloud.

• both the nucleus and electron cloud.

Which of the following is NOT an element?

• titanium

• helium

• hydroxy

• boron

Which part of the atom contains protons and neutrons?

• Electron cloud

• Nucleus

• Outer shell

Which of the following is a noble gas?

• Oxygen

• Hydrogen

• Neon

• Carbon

________ are the smallest units of chemical elements. Choose the best answer.

• molecules

• atoms

• compounds

Which element is represented by the symbol 'O' in the periodic table?

• Gold

• Oxygen

• Osmium

• Oganesson

Which item on this element square is the chemical symbol?

• Copper

• 29

• Cu

• 63.546