3.2- 7th grade

1.

1 point

________ is anything that has mass and takes up space.

2.

1 point

Emotions, thoughts, and ideas are not _______ either.

3.

1 point

The term _____ comes from a Greek word that means "cannot be divided."

4.

1 point

_______________, a French chemist who lived about 2,000 years after Democritus, also was curios about matter-- especially when it changed form.

5.

1 point

__________ thought he could design an atomic model that explained the results of those experiments.

6.

1 point

____________ knew that like charges repel each other and opposite charges attract each other.

7.

1 point

In _______, Thomson received the Nobel Prize in physics for his work on the discovery of the electron.

8.

1 point

Thomson's model , can be compared to _________ chips spread throughout a ball of cookie dough.

9.

1 point

Rutherford called the positively charged, central part of the atom the ___________.

10.

1 point

An _______ is matter made of only one kind of atom.

11.

1 point

At this time, _____ elements are known and 90 of them occur naturally on Earth.

12.

1 point

Some _________ elements have important uses in medical testing and are found in smoke detectors and heart pacemaker batteries.

13.

1 point

Chemists have created a called the _______ table of the elements to help them organize and

14.

1 point

There are rows and ______ that represent relationships between the elements.

15.

1 point

The elements in each group have similar ________ related to their structure.

16.

1 point

____ is the symbol for chlorine.

17.

1 point

The top number is the element's _____ number.

18.

1 point

It tells you the number of _______ in the nucleus of each atom of that element.

19.

1 point

What is the atomic number for NA?

20.

1 point

They are called __________, which are atoms of the same element that have different number of neutrons.

21.

1 point

An atom's ______ ______ is the number of protons plus the number of neutrons it contains.

22.

1 point

The ______ ________ is the weighted average mass of the isotopes

23.

1 point

The calculation of atomic mass takes into account the different isotopes of the _________.

24.

1 point

____ generally have a shiny or metallic luster and are good conductors of heat and electricity.

25.

1 point

Metals are also ______, which means they can be drawn into wires without breaking.

26.

1 point

____________ are elements that are usually dull in appearance.

27.

1 point

__________ are elements that have characteristics of metals and nonmetals.