CFA 3 PREP

If you want to identify an element, which piece of information would best help you identify it?

• how many protons the element has

• what charge the element has

• how many neutrons the element has

• how many electrons the element has

Neutrons are neutral. This means that

• neutrons are not involved in chemical reactions.

• neutrons do not have a charge.

• neutrons do not have mass

• neutrons are neither acidic or basic.

The _____ of an atom are negatively charged.

• electrons

• negatrons

• neutrons

• protons

The picture shows a model of a helium atom and a lithium atom. Which of the following statements is true about the lithium and helium atoms?

• Helium has more protons, neutrons, and electrons.

• Lithium is much smaller than helium.

• There is no difference between helium and lithium.

• Lithium has more protons, neutrons, and electrons

Negatively charged particles of an atom

• proton

• neutron

• electron

• matter

A small particle in the nucleus of the atom, with no electrical charge

• proton

• nucleus

• neutron

• cell

The central core of an atom which contains protons and neutrons

• neutron

• electron cloud

• nucleus

• core

The space where electrons are outside of the nucleus of the atom

• atomic mass

• electron cloud

• subatomic particle

• outer space

The mass of the protons and neutrons in an atom is the ____________ ____________.

• atomic mass

• atomic number

• electron cloud

• number of electrons

The positively charged particles in an atom's nucleus

• Proton

• Electron

• Neutron

• cell