Module 16 Terms

Question 1

the smallest particle of an element that still retains the properties of the element.

Answer 1

Atom

Question 2

the small, positively charged center of an atom, contains protons and neutrons.

Answer 2

nucleus

Question 3

tiny atomic particle that has mass and a positive electric charge.

Answer 3

proton

Question 4

tiny atomic particle that is electrically neutral and has about the same mass as a proton.

Answer 4

neutron

Question 5

tiny atomic particle with little mass and a negative electric charge; an atom’s electrons are equal in number to its protons and are located in a cloudlike region surrounding the nucleus.

Answer 5

electron

Question 6

area around the nucleus of an atom where the atom’s electrons are most likely to be found.

Answer 6

electron cloud

Question 7

particle of matter that makes up protons and neutrons.

Answer 7

quark

Question 8

number of protons contained in an atom’s nucleus.

Answer 8

atomic number

Question 9

combined number of protons and neutrons in the nucleus of an atom

Answer 9

mass number

Question 10

an atom of an element that has a different mass number than the element but the same chemical properties

Answer 10

isotope

Question 11

weighted-average mass of an element’s isotopes according to their natural abundance

Answer 11

average atomic mass

Question 12

organized list of all known elements that are arranged by increasing atomic number and by changes in chemical and physical properties

Answer 12

periodic table

Question 13

The amount of time it takes one wavelength to pass a fixed point, expressed in seconds

Answer 13

period

Question 14

vertical column in the periodic table

Answer 14

group

Question 15

uses the symbol for an element and dots representing the number of electrons in the element’s outer energy level

Answer 15

electron dot diagram