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Subatomic particles with a negative charge

• Electrons

• Neutrons

• Protons

• Quarks

Most of the mass in an atom is made up of _____________________?

• protons and electrons
• protons and neutrons
• neutrons and electrons
• electrons and quarks

Water (H₂O) is an element.

• true
• false

DIFFERENT kinds of atoms chemically combined to form a substance are

• Mixture
• Element
• Compound
• Substance

What is the relationship between protons and electrons in an atom?

• same mass

• they are equal

• same charges

The mass number of an atom is equal to the number of ______ in an atom.

• Protons
• Neutrons
• Protons + Neutrons
•  Electrons

Which subatomic particle determines the identity of an element?

• protons

• neutrons

• electrons

Which subatomic particle determines the charge of an atom?

• protons

• neutrons

• electrons

The electron is not included in the calculations for the atomic mass because

• It has negative charge

• It is located in the outer energy levels of the atom

• Its mass is basically zero

• It attracts neutral particles

What is the number of protons that the element in this image contain?

• 14
• 7
• 15
• 18