Y08 01 Atoms, elements and compounds

On which part of the periodic table do you find non-metallic elements?

• Left hand side

• Middle section

• Right hand side

• Bottom section

Define a mixture

• A single element that cannot be broken down

• Two or more elements or compounds are present without being chemically bonded together.

• A chemical reaction between two substances

• A homogeneous solution of two or more substances.

Which two subatomic particles have the same mass?

• Electrons and protons

• Protons and neutrons

• Neutrons and positrons

• Photons and neutrons

How many electrons can fit on the first electron shell?

• 1

• 2

• 3

• 4

What is the charge of a neutron?

• Positive

• Negative

• Zero. No charge

• Neutral charge

What is the maximum number of electrons that can fit on the second electron shell?

• 2

• 8

• 18

• 32

How does mass change in a chemical reaction?

• It increases due to the formation of new substances.

• It decreases as energy is released during the reaction.

• It doesn't. The total mass of reactants = total mass of products

• It fluctuates depending on the temperature of the reaction.

What does the atomic number tell us?

• Number of neutrons in an atom.

• Number of protons. This determines the element.

• Total number of electrons in an atom.

• Mass of the atom in atomic mass units.

What does the mass number represent?

• Number of protons + neutrons

• Number of protons only

• Number of neutrons only

• Total number of electrons

What is the smallest part of an element that can exist?

• Molecule

• Atom

• Compound

• Ion