4-5 Unit 2

Question 1

explain metals state at room temperature?

Answer 1

solids, except for mercury (a liquid)

Question 2

what are metals appearance

Answer 2

• shiny luster

Question 3

what are metals conductivity

Answer 3

they are good conductors of heat and electricity

Question 4

what are metals malleability and ductility

Answer 4

• they are malleable and ductile

Question 5

What is the state of nonmetals at room temperature

Answer 5

• some are gases some are solids and only one is a liquid which is bromine

Question 6

what are nonmetals appearance

Answer 6

not very shiny

Question 7

what are non-metals conductivity

Answer 7

poor conductors of heat and electricity

Question 8

what is malleability and ductility of non-metals?

Answer 8

• brittle

- not ductile

Question 9

what is metalloids state at room temperature

Answer 9

solids

Question 10

what is the appearance of metalloids?

Answer 10

-can be shiny or dull

Question 11

what are metalloids conductivity

Answer 11

• may conduct electricity

- poor conductors of heat

Question 12

what are metalloids malleability and ductility

Answer 12

• brittle and not ductile

Question 13

what is the only metal found in the crust of the earth

Answer 13

silicon and it appears as silicon dioxide

Question 14

what is silicon a nonmetal, metal or metalloid

Answer 14

although silicon can be made to conduct electricity its properties lie in between those of metals and non-metals.

Question 15

put non-metals, metals, and metalloids in order from least common to most common

Answer 15

metalloids are few in number
non-metals are more numerous in
and metals are the most numerous

Question 16

what metals are used in your mouth when you get filling and why?

Answer 16

Gold, Silver, And copper can be mixed and will not react with oxygen. These metals need to be unreactive with mild acids and with gases that are inhaled and exhaled.

Question 17

what is a chemical family

Answer 17

is used to describe a group of related elements that have similar properties

Question 18

Gold silver and copper were once used to make coins they also referred to what?

Answer 18

coinage metals

Question 19

what elements can be formed with oxygen readily?

Answer 19

aluminum, and iron

Question 20

what elements can be formed with oxygen not readily?

Answer 20

copper, gold, and silver

Question 21

what metal has the best electrical conductivity?

Answer 21

Silver has the best of all metals.

Question 22

what is the second-best of all metals the has an electrical conductivity

Answer 22

copper

Question 23

Why are alkali metals so reactive

Answer 23

there is a tendency for electrons to be found in pairs. Each alkali metal has an unpaired electron and tends to get rid of the electron by forming a compound

Question 24

how does magnesium look when it burns

Answer 24

it gives off intense white light and white smoke.

Question 25

where does the name earth metals come from

Answer 25

the early chemists who thought anything that was insoluble in water and unchanged by heat was one of the earth metals.

Question 26

why does the filament burn of lightbulb?

Answer 26

it burns because electrons of hot tungsten atoms are transferred to nearby oxygen atoms.

Question 27

do noble gases have unpaired electrons

Answer 27

no, therefore noble gas atoms are highly not likely to be part of a chemical reaction.

Question 28

is it possible for a noble gas to become a single atom again?

Answer 28

yes, the very large noble gas atoms can be made to react chemically. Even when they do react their compounds soon decompose, allows the noble gases to separate into single atoms again.

Question 29

halogens are naturally found in what

Answer 29

in the form of compounds because they react with almost every element.

Question 30

do halogens have unpaired electrons

Answer 30

yes, however, they have the tendency to gain an electron when they form compounds

Question 31

who invented the periodic table

Answer 31

Dmitri Mendeleev

Question 32

what did Mendeleev notice when he ordered the elements in increasing atomic mass

Answer 32

he found that the properties of teh elements repeated at definite or periodic, intervals.

Question 33

what did Mendeleev note when he found missing spaces in the periodic table?

Answer 33

he inferred that the midding elements would have properties similar to those of another member of the family.

Question 34

what is the atomic number

Answer 34

is the number of protons and element has in its nucleus.

Question 35

atoms contain and an equal number of what

Answer 35

electrons and protons so it stays balanced.

Question 36

what is the formula to get the number of neutrons

Answer 36

mass number-atomic number

Question 37

what is teh formula to get the mass number

Answer 37

number of protons + number of neutrons

Question 38

what form of iodine can be used to produce an image of the thyroid gland

Answer 38

the radioactive form

Question 39

what two elements create salt

Answer 39

sodium and chlorine