Atomic structure

What is the atomic number of an element?

• The number of neutrons in the nucleus

• The number of protons in the nucleus

• The total number of protons and neutrons

• The number of electron shells

Which subatomic particle has a negative charge?

• Proton

• Neutron

• Electron

• Nucleus

The nucleus of an atom contains only neutrons.

• True

• False

Tags

NGSS.MS-PS1-1

Elements that have properties of both metals and nonmetals are called __________.

The mass number of an atom is equal to:

• The number of protons

• The number of electrons

• The number of protons plus the number of neutrons

• The number of neutrons minus the number of protons

Which of the following is NOT a fundamental subatomic particle?

• Proton

• Neutron

• Electron

• Molecule

Tags

NGSS.MS-PS1-5

Electrons have a positive charge.

• True

• False

Tags

NGSS.MS-PS2-3

In the periodic table, elements are arranged in order of increasing:

• Atomic mass

• Atomic number

• Number of neutrons

• Number of electron shells

Which of the following best describes the trend in atomic radius as you move from left to right across a period?

• Increases

• Decreases

• Remains constant

• Fluctuates randomly

The ability of an atom to attract electrons in a chemical bond is called:

• Ionization energy

• Electron affinity

• Electronegativity

• Atomic radius