Chapter 2 Practice

What is the difference between an element and a compound?

• An element is a pure substance made up of only one type of atom, while a compound is a substance made up of two or more different types of atoms chemically bonded together.
• An element is a mixture of different substances, while a compound is a pure substance
• An element and a compound are the same thing
• An element is made up of two or more different types of atoms, while a compound is made up of only one type of atom

Whereas essential elements are required in large amounts by organisms, (a)   elements are only needed in very small quantities.

Match the subatomic particles with their correct charges:

• Proton (+1), Neutron (0), Electron (-1)

• Proton (+1), Neutron (+1), Electron (-1)

• Proton (-1), Neutron (0), Electron (+1)

• Proton (0), Neutron (+1), Electron (-1)

Protons and Neutrons are located in the (a)   of an atom.

An atom that has gained or lost an electron is known as an (a)   .

The atomic mass of an element is determined by its:

• Protons

• Neutrons

• Electrons

• Ions

An element's atomic number is equal to its:

• Protons

• Electrons

• Neutrons

• Isotopes

Isotopes are elements that differ in their number of:

• protons
• valence electrons
• neutrons
• electrons

A (a)   bond is formed when two atoms share electrons.

Tags

NGSS.HS-PS1-1

An (a)   bond is formed when electrons are transferred from one element to another, creating ions.