Atoms- retest

Which particles would you find in the nucleus of an atom?

• protons and neutrons

• electrons and protons

• electrons only

• neutrons and electrons

Which of the following correctly lists the pair of subatomic particles that balance the charge of the atom?

• Protons and neutrons

• Electrons and neutrons

• Protons and electrons

• Electrons and ions

What is the atomic mass of an atom with seven protons, seven neutrons, and eight electrons?

• 15

• 7

• 8

• 14

Which of the following properties uniquely identifies every element?

• Number of valence electrons

• Phase at room temperature

• Number of protons

• Charge of the atom

An element’s reactivity and other chemical properties are determined by the number of -

• isotopes it has.

• oxidation states.

• orbitals in an atom.

• valence electrons.

Molybdenum has an atomic number of 42. This means that molybdenum –

• has a freezing point of 42° Fahrenheit.

• belongs to Group 42 on the Periodic Table.

• can form 42 bonds with other atoms.

• contains 42 protons in its nucleus.

A portion of the Periodic Table is provided. Which of the following sequences of elements would all have four valence electrons?

• B, Si, As, Te

• C, Si, Ge, Sn

• O, S, Se, Te

• Ga, Ge, As, Se

A simplified version of the Periodic Table of the Elements is provided. What type of elements would you most likely find in the circled portion?

• Nonmetals

• Metals

• Noble gases

• Halogens

A simplified version of the Periodic Table of the Elements is provided. When moving down a column in the Periodic Table, which of the following stays the same?

• The size of the atomic radius.

• The density of the element.

• The boiling point of the element.

• The number of valence electrons.

The nucleus of the atom contains 8 protons and 9 neutrons. The atom is electrically neutral. How many electrons does this atom have?

• 4

• 8

• 9

• 15