Grade 8 Module Introduction to Chemistry Chapter 3 Elements and the Periodic Table

Question 1

In general, which of the following statements about metals is true?

Accepted Answer

Metals are malleable, ductile, and carry electric currents.

Question 2

Scientific theories often make use of _____, which are representations of an idea.

Accepted Answer

models

Question 3

The horizontal rows in the periodic table are known as groups.

Accepted Answer

False

Question 4

At room temperature, more than half of the nonmetal elements are

Accepted Answer

gases

Question 5

Beta radiation consists of particles that are identical to

Accepted Answer

electrons

Question 6

From an element's location in the periodic table, you can predict

Accepted Answer

its properties

Question 7

Atoms with the same number of protons and different numbers of neutrons are called alloys

Accepted Answer

False

Question 8

The emission of radiation by an unstable atomic nucleus was named _____ by Marie Curie.

Accepted Answer

radioactivity

Question 9

Measurements of half-life make radioactive isotopes useful for

Accepted Answer

determining the ages of rocks and fossils

Question 10

Nonmetals can be found on the left side of the periodic table.

Accepted Answer

False

Question 11

Elements that easily transmit electricity and heat display the property known as _____.

Accepted Answer

conductivity

Question 12

The elements that do not ordinarily form compounds are

Accepted Answer

noble gases

Question 13

Earth element is given a specific ___ that usually consists of one or two letters.

Accepted Answer

chemical symbol

Question 14

A column of elements in the periodic table is called a group, or _____.

Accepted Answer

family

Question 15

The modern periodic table is organized according to atomic mass.

Accepted Answer

False

Question 16

The two most common alkaline earth metals are

Accepted Answer

calcium and magnesium

Question 17

In Rutherford's foil experiment, most + charged articles passed, but a few deflected, because

Accepted Answer

an atom's + charge must be clustered in region in its center

Question 18

Mendeleev created the first periodic table by arranging elements in order of

Accepted Answer

increasing atomic mass

Question 19

The atomic number of an element is based on the

Accepted Answer

number of protons in its nucleus

Question 20

Electron orbits in Thompson's model resemble planets orbiting the sun or layers of an onion.

Accepted Answer

False

Questions 20