chapter 5.2

Question 1

periodic law

Answer 1

when elements are arranged by an increasing number of protons, properties repeat in a pattern

Question 2

what are columns called?

Answer 2

groups

Question 3

what is similar about the elements in the same group?

Answer 3

similar chemical properties; same number of valence electrons

Question 4

what are the rows called?

Answer 4

period

Question 5

how many periods are there?

Answer 5

7

Question 6

what is the last elements in most periods?

Answer 6

noble gases

Question 7

what is the first element in a period?

Answer 7

very reactive metals

Question 8

what does the element key tell us?

Answer 8

atomic number, chemical symbol, element name, average atomic mass

Question 9

what is the most common state of metals?

Answer 9

solids, excepts for mercury

Question 10

ductility

Answer 10

able to be drawn into thin wires

Question 11

malleability

Answer 11

able to be hammered without shattering

Question 12

conductivity

Answer 12

allowing heat or energy to pass through

Question 13

transition metals

Answer 13

bridge between elements on the right and left side of the table

Question 14

are nonmetals similar to metals?

Answer 14

no, their properties are generally opposite of metals

Question 15

are non-metals good conductors?

Answer 15

no they cannot carry heat or electricity well

Question 16

what is the boiling point of nonmetals?

Answer 16

very low

Question 17

what is the most common state of nonmetals?

Answer 17

gases at rm temp

Question 18

nonmetal malleability:

Answer 18

nonmetals are brittle, no malleability

Question 19

do metalloids have conductivity?

Answer 19

ability to carry heat and electricity varies with temperature

Question 20

where are metalloids on periodic table?

Answer 20

the stair-step pattern

Question 21

when moving to the right of a table, what happens to the atomic size, metallic properties, and ability to lose an electron?

Answer 21

it decreases

Question 22

when moving to the right of a table, what happens to the ability to gain electrons?

Answer 22

it increases, except for noble gases

Question 23

where do we get atomic mass?

Answer 23

the distribution of an element’s isotopes in nature and masses

Question 24

how is atomic mass defined?

Answer 24

1/12 the mass of a carbon-12 atom

Question 25

weighted average

Answer 25

where some values are more important than other values

Question 26

how many elements occur naturally?

Answer 26

92 elements

Question 27

metals in groups 3-12 are called?

Answer 27

transition metals

Question 28

valence electron?

Answer 28

electron that is in the highest occupied energy level of an atom

Question 29

the number of an A group matches…

Answer 29

the number of valence electrons in electron configuration