Science Vocab Chapter 9

Question 1

What is the smallest piece of an element that still represents that element?

Answer 1

Atom

Question 2

What is a particle with one negative charge (-1)?

Answer 2

Electron

Question 3

What are most of an atom’s mass and positive charge is concentrated in a small area in the center of an atom?

Answer 3

Nucleus

Question 4

What is an atomic particle that has one positive charge (+1)?

Answer 4

Proton

Question 5

What is a neutral particle that exists in the nucleus of an atom?

Answer 5

Neutron

Question 6

What is an area around an atomic nucleus where an electron is most likely to be located

Answer 6

Electron Cloud

Question 7

What are the number of protons in an atom of an element?

Answer 7

Atomic Number

Question 8

What are atoms of the same element that have different numbers of neutrons?

Answer 8

Isotopes

Question 9

What is the sum of a number of protons and neutrons in an atom?

Answer 9

Mass Number

Question 10

What is the average mass of the elements isotopes, weighted according to the abundance of each isotope?

Answer 10

Average Atomic Mass

Question 11

What are elements that spontaneously emit radiation?

Answer 11

Radioactive

Question 12

What is the process that occurs when an unstable atomic nucleus changes into another more stable nucleus by emitting radiation?

Answer 12

Nuclear Decay

Question 13

What is an atom that is no longer neutral because it has gained or lost electrons?

Answer 13

Ion