Atoms and Molecules

The smallest unit of an element is (a)   .

• atom
• particle
• cell
• molecule

Tags

NGSS.MS-PS1-1

The three subatomic particles that make up an atom are (a)   .

• protons, neutrons, and positrons
• protons, neutrons, and electrons
• electrons, photons, and neutrinos
• protons, electrons, and quarks

What is the charge of a proton?

• -1

• +1

• 0

• +2

What is the charge of a neutron?

• 0

• -1

• 2

• 1

What is the atomic number of an element?

• The atomic number of an element is the number of neutrons in the nucleus of an atom.

• The atomic number of an element is the number of electrons in the nucleus of an atom.

• The atomic number of an element is the number of protons and neutrons in the nucleus of an atom.

• The atomic number of an element is the number of protons in the nucleus of an atom.

There are (a)   elements in the periodic table.

• 100
• 118
• 92
• 110

The center of an atom is called (a)   .

• Nucleus
• Electron
• Proton
• Neutron

What is the symbol for Helium in the periodic table?

• He

• H

• Li

• Be

What is an atom?

• An atom is a type of molecule.

• An atom is the smallest unit of a chemical element that retains the properties of that element.

• An atom is a unit of energy.

• An atom is a form of radiation.

Tags

NGSS.MS-PS1-1

How many hydrogen atoms are there in a water molecule? 

• 0
• 1
• 2
• 3

Tags

NGSS.MS-PS1-1