Atomic Structure and The Periodic Table Summative Assessment

The overall sign on an atom that shows if it is positive, negative or neutral:

• Proton
• Charge
• Electron
• Neutron

Atoms of the same element that have the same number of protons but different numbers of neutrons are called:

• Ions
• Isotopes
• Metalloids
• Alloys

Atoms have neutrons and ________ in the nucleus.

• protons
• electrons
• shells
• ions

Protons and _______ have equal but opposite charges.

• neutrons
• shells
• ions
• electrons

The atomic number of an element that has 9 protons, 9 electrons, and 10 neutrons is _____.

• 9
• 10
• 19
• 28

Which particle contributes least to the total mass of an atom?

• Proton
• Neutron
• Electron
• Nucleus

Which of the following is unique for any given element?

• the number of neutrons
• the charge on the electrons
• the number of protons
• the mass of a neutron

The atomic mass number of a single atom is:

• the sum of the protons and neutrons in the atom
• twice the number of protons in one atom of the element
• a ratio based on the mass of a carbon-12 atom
• a weighted average of the masses of the element’s isotopes

An atom with an unequal number of protons and electrons is said to have (a) ___.

• no charge
• balance
• charge
• unbalance

What is determined by adding the number of protons and neutrons of an atom?

• atomic number
• atomic weight
• mass number
• atomic matter