Periodic Table 8th grade

Question 1

The electrons in an atom's outermost "shell" or "orbit," available to share or trade.....?

Accepted Answer

valence electrons

Question 2

Elements like Si and Ga conduct electricity only part of the time, handy in electronics!

Accepted Answer

semiconductor

Question 3

These elements are not found in nature; they're made by humans in labs or nuclear reactors!

Accepted Answer

synthetic elements

Question 4

Group 18's inert elements, like He and Ne, have full outer shells and don't react chemically.

Accepted Answer

noble gases

Question 5

Each vertical column of the periodic table, with elements that have similar properties . . .

Accepted Answer

group

Question 6

These elements are often dull, brittle, and poor conductors of heat and electricity . . .

Accepted Answer

nonmetals

Question 7

Group 1, full of reactive metals like Sodium and Potassium--except for Hydrogen!

Accepted Answer

alkali metals

Question 8

Groups on the periodic table represent what?

Accepted Answer

valence electrons

Question 9

The 2nd series of inner transition metals, including nuclear fuel like Uranium and Plutonium...

Accepted Answer

actinides

Question 10

These metals are found in Groups 3-12--the smallest groups, in the middle of the table!

Accepted Answer

transition elements

Question 11

Group 2, with reactive metals like Beryllium, Magnesium, and Calcium . . .

Accepted Answer

alkaline earth metals

Question 12

The first series of inner transition metals, also called the "rare earths" (in your iPhone!)

Accepted Answer

lanthanides

Question 13

Lustrous, malleable, ductile elements that conduct heat and electricity well are _____________.

Accepted Answer

metals

Question 14

Periods (rows) on the periodic table represent what?

Accepted Answer

energy levels

Question 15

These elements have some properties of metals and some like nonmetals . . . .

Accepted Answer

metalloid

Question 16

Each row across the periodic table is a ____________. Hydrogen and Helium are in #1 together.

Accepted Answer

period

Question 17

Substances like Platinum that speed up chemical reactions, but are not changed in the process.

Accepted Answer

catalyst

Question 18

The widely-varied elements in Groups 1-2 & 13-18, on the far right and left ends of the table?

Accepted Answer

representative elements

Question 19

Group 17's "salt formers," like Fluorine and Chlorine, react with alkali metals to make salts.

Accepted Answer

halogens

Questions 19