Chapter 3.1

Question 1

Atomic Mass

Answer 1

The number beneath the element symbol s
gives the average mass of protons and neutrons in the nucleus of an element.

Question 2

element

Answer 2

all the atoms in a substance are the same

Question 3

element symbol

Answer 3

a symbol that represents the elements (usually 1 or 2 letters)

Question 4

atomic number

Answer 4

the top number on the element (reps protons)

Question 5

periodic table

Answer 5

a chart that lists all the natural and human-made types of elements that are known to exist

Question 6

period

Answer 6

the left and right rows

Question 7

group

Answer 7

up and down rows
all the same number of valence electrons
all have similar properties.

Question 8

trace amount

Answer 8

a very small quantity of a substance somewhere else in another substance

Question 9

trace elements

Answer 9

elements that are needed in small quantities to maintain optimal human health
too much or too little can be harmful or toxic.

Question 10

macronutrients

Answer 10

elements needed in large qualities by your body.