CH.1 Notes Quiz

What are valence electrons?

• Electrons found in the nucleus

• Electrons that participate in chemical bonds

• Protons found in the outermost shell

• Neutrons involved in chemical reactions

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the center of an atom called?

• Electron cloud

• Nucleus

• Proton pack

• Neutron core

Which particles are found in the nucleus of an atom?

• Electrons and protons

• Neutrons and electrons

• Protons and neutrons

• Protons, neutrons, and electrons

What is an element?

• A mixture of two or more substances

• A substance made of only one kind of atom

• A compound made of atoms and molecules

• A pure substance made of two kinds of atoms

What does the atomic number of an element represent?

• The number of neutrons in the nucleus

• The number of electrons in the outer shell

• The number of protons in the nucleus

• The total number of protons and neutrons in the nucleus

What is atomic mass?

• The mass of an electron

• The total number of protons in an atom

• The total mass of the protons and neutrons in an atom

• The mass of the nucleus alone

What is a pure substance?

• A substance that cannot be separated into simpler substances by physical means

• A mixture of two or more elements

• A substance with varying composition

• A compound that can be broken down into elements

How many valence electrons does an atom with atomic number 8 have?

• 2

• 4

• 6

• 8

What is the charge of a proton?

• Positive

• Negative

• Neutral

• Variable

Which particle determines the chemical properties of an atom?

• Neutron

• Proton

• Electron

• Nucleus