Periodic table, periodic trends & metals and nonmetals

Question 1

there are 118 known kinds of atoms, one kind for each element

Answer 1

atomic structure

Question 2

charge: +1, relative mass: 1837,EQUALS TO ATOMIC NUMBER

Answer 2

protons

Question 3

number of protons in nucleus identifies the atom EQUALS TO NUMBER OF PROTONS

Answer 3

Atomic number

Question 4

charge: 0, relative mass: 1839, EQUALS TO MASS NUMBER/ATOMIC WEIGHT - PROTONS

Answer 4

neutrons

Question 5

number of protons + number of neutron

Answer 5

mass number/atomic weight

Question 6

charge: -1, relative mass: 1, EQUALS TO NUMBER OF PROTONS, IT DETERMINES THE CHEMICAL PROPERTIES OF AN ATOM

Answer 6

electrons

Question 7

average mass of all isotopes of element

Answer 7

atomic mass

Question 8

same element, same protons, same atomic number, diff neutrons, mass number

Answer 8

isotopes

Question 9

= number of valence electron, vertical column of elements in the periodic table

Answer 9

group number

Question 10

similar chemical behavior

Answer 10

same column

Question 11

electrons in outermost of valence shell

Answer 11

valence electron

Question 12

horizontal row of elements in the periodic table. For identification purposes, the periods are numbered sequentially with Arabic numbers, starting at the top of the periodic table.

Answer 12

period

Question 13

In the _______ which has been in use for many years, groups are designated by using Roman numerals and the letters A and B.

Answer 13

first notation

Question 14

In the _____ which an international scientific commission recommended several years ago, the Arabic numbers 1 through 18 are used.

Answer 14

second notation

Question 15

are soft, shiny metals that readily react with water.

Answer 15

alkali metals (1A)

Question 16

are also soft, shiny metals, but they are only moderately reactive toward water.

Answer 16

alkaline metals (2A)

Question 17

are reactive elements that are gases at room temperature or become such at temperatures slightly above room temperature.

Answer 17

halogens (7A)

Question 18

are unreactive gases that undergo few, if any, chemical reactions.

Answer 18

noble gases (8A)

Question 19

order in the
increasing amount of chemical information that had become available.

Answer 19

periodic law

Question 20

In 1869, these efforts culminated in the discovery of what is now called the
periodic law, proposed independently by

Answer 20

Dmitri Mendeleev and Julius Lothar Meyer

Question 21

visual representation of the behavior described by the periodic law. a tabular arrangement of the elements in order of increasing atomic number such that elements having similar chemical properties are positioned in vertical columns.

Answer 21

periodic table

Question 22

is the distance from the nucleus to the outer edge of the valence shell.

Answer 22

atomic radius

Question 23

amount of energy required in order to remove electron from an atom

Answer 23

ionization energy

Question 24

left to right, bottom to top

Answer 24

increasing ionization energy, decrease atomic radius

Question 25

why atomic radius decrease in left to right, bottom to top

Answer 25

caused by increase number of proton and electron

Question 26

right to left, top to bottom

Answer 26

increasing atomic radius, decreasing ionization energy

Question 27

why increasing atomic radius in right to left, top to bottom

Answer 27

caused by electron shielding

Question 28

why decreasing ionization energy in right to left, top to bottom

Answer 28

because it is far from attraction of nucleus

Question 29

atomic mass = (percent/100) x given AMU, add the answers of the given, if TRACE, IT IS NOT INCLUDED

Answer 29

formula of AMU

Question 30

an element that has the characteristic properties of luster, thermal conductivity, electrical conductivity, and malleability.

Answer 30

metals

Question 31

With the exception of _____ all metals are solids at room temperature (258C).

Answer 31

mercury

Question 32

an element characterized by the absence of the properties of luster, thermal conductivity, electrical conductivity, and malleability. have lower densities and lower melting points than metals.

Answer 32

nonmetals

Question 33

The only nonmetal that is a liquid at room temperature is

Answer 33

bromine

Question 34

properties of metals

Answer 34

high thermal conductivity, almost all are solids, ductile

Question 35

properties of nonmetals

Answer 35

bad conductor of electricity, dullness, brittleness, softness

Question 36

The majority of the elements are metals. Only ___elements are nonmetals

Answer 36

23

Question 37

only nonmetals in left side

Answer 37

hydrogen

Question 38

Most _____ are relatively common and are found in many important compounds.

Answer 38

nonmetals

Question 39

two most abundant elements that are nonmetals?

Answer 39

oxygen and silicon 80.2%

Question 40

all atoms in body that are nonmetals

Answer 40

99%

Question 41

9.5%

Answer 41

hydrogen

Question 42

65%

Answer 42

oxygen

Question 43

18.5%

Answer 43

carbon

Question 44

3.5%

Answer 44

nitrogen

Question 45

2/3 of body or 9.5%

Answer 45

h2o

Question 46

must be obtained from food sources, are called _____. Several of this are metals rather than nonmetals.

Answer 46

dietary minerals