ch3

Question 1

Electron relative mass

Answer 1

1/1836

negligible mass number

Question 2

What is proton number?

What are the other terms used interchangeably with it?

Answer 2

The number of protons in an element/compound

other terms
atomic number

Question 3

Nucleon number

Terms used interchangeably with it

Answer 3

Total number, protons, neutrons in an atom

Atomic Mass

relative to C-12
relative atomic mass
relative molecular mass
Ar/Mr

Question 4

Octet, duplet config

Answer 4

Oct: 8 valence
Dup: 2 e- in valence shell

alt. answer
8 electrons in valence shell

Question 5

ion definition

Answer 5

particle formed,
atom, or group of atoms
gains/loses e-
no. protons, neutrons remains same

Question 6

-ide

means…?

Answer 6

ide - no oxygen

Question 7

Chemical bond strength of force

Answer 7

very strong

Question 8

Silver charge
Zinc charge

Answer 8

Silver
Ag +

Zinc
Zn 2+

Question 9

Is the metal written in the front or the back in a chemical formulae

Answer 9

Front

Question 10

Which grp an atom belongs to?
+ Which grp is noble gas?

Answer 10

Metallic (<= 3 Valence)
G1, 2, 3

Non-metallic (>3 valence)
G (10 + Valence e-)

Noble gas
G18

Question 11

Why is noble gas stable

Answer 11

full valence shell, cannot react with other atoms

Octet config not accepted. Helium is a duplet config yet it is stable

Valence electrons = outermost electrons

Question 12

charge of bromine

Answer 12

Br-

Question 13

is bromine a metal
is barium a metal
is sulfur a metal

Answer 13

bromine: nonmetal
barium: metal
sulfur: nonmetal

check periodic table!!

Question 14

define elements

Answer 14

pure substance, cannot broken down any simpler substances by chemical methods

Question 15

when do molecules of elements form? are they still elements?

Answer 15

molecules of elements -> 2 or more atoms, same elements, chemically bonded together

yes, they are still elements

Question 16

2 general classify, metal

Answer 16

metal
non metal

Question 17

define compounds

Answer 17

1. pure substances
2. atoms of two/more different elements, chemically bonded

Question 18

properties of compound

Answer 18

• properties different from constituent elements
• made of fixed ratio of atoms
• constituent elements only separated via chemical methods

Question 19

how to form mixture?

Answer 19

2 diff. elements not chemically bonded tgt

2 diff. compounds not chemically bonded tgt

elements + compounds not chemically bonded tgt

NOT formed by chemical reactions

Question 20

define mixture

Answer 20

different substances exsisting tgt,
not chemically bonded tgt

Question 21

how does impurities affect boiling/melting pt?

Answer 21

• melt/boil over range of temp.
• above pure substance boiling pt.
• below pure substance melting pt.

i.e.

pure substance X 90 deg melting, 100 deg boiling becomes a wider scope.

impure substance X 70-89deg melting, 101-150deg boiling

Question 22

naming of isotopes

Answer 22

(element) - (no. of protons+neutrons)

neutrons are distributed equally in nucleus

Question 23

which electron shells have lowest energy

Answer 23

innermost shells req lowest energy, e- to occupy