3.2- 7th grade

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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.