7th Grade Physical Science Chapter 3 Atoms, Elements, and the Periodic Table

Question 1

If an atom has 12 protons and 10 electrons, what is the overall charge of the atom?

Accepted Answer

+2

Question 2

If an atom has a +2 charge, which of the following must be true?

Accepted Answer

there are more protons then electrons

Question 3

The contents of this cup could be classified as which of the following?

Accepted Answer

homogeneous mixture

Question 4

CO2 is an example of which of the following?

Accepted Answer

compound

Question 5

Which of these is not found in the nucleus of an atom?

Accepted Answer

electron

Question 6

metals, nonmetals, and metalloids: these are examples of which of these?

Accepted Answer

elements

Question 7

Which of the following identifies the three atoms shown here?

Accepted Answer

hydrogen, hydrogen, hydrogen

Question 8

An isotope of chlorine has a mass number of 36 and an atomic number of 17. How many neutrons?

Accepted Answer

19

Question 9

What is this?

Accepted Answer

heterogenous mixture

Question 10

Which of these has a positive charge?

Accepted Answer

proton

Question 11

Which of these is equal to the atomic number?

Accepted Answer

the number of protons

Question 12

What was wrong with Thomson's "cookie dough" model of the atom?

Accepted Answer

He imagined the nucleus too large

Question 13

The number of protons plus the number of neutrons is called which of the following?

Accepted Answer

mass number

Question 14

Carbon-14 and Carbon-12 are isotopes of each other. Which of the following is true about them?

Accepted Answer

The have a varying number of neutrons

Question 15

The picture shows different molecules not making a compound. What term best describes this pic?

Accepted Answer

mixture

Question 16

Which of these would NOT be considered matter?

Accepted Answer

Light

Question 17

Which of these has no charge?

Accepted Answer

neutron

Questions 17