Chemistry Chapter 4

Question 1

Dimitri Mendelev

Answer 1

created periodic table, arranged by increasing atomic mass (mendelev=mass)

Question 2

Mosley

Answer 2

modern periodic table, by atomic number

Question 3

Groups

Answer 3

• alkali metals: most reactive metals with water
• alkaline earth metals
• transition metals
• halogens: most reactive nonmetals
• noble gases: unreactive

Question 4

Metalloids

Answer 4

some properties of nonmentals and metals

- B, Si, Ge, As, Sb, Te, Po, At, Ts

Question 5

Metals

Answer 5

ductile, malleable, conductors, melt at higher temps, solid at room except for mercury

Question 6

Nonmetals

Answer 6

dull, poor conductors of heat and electricity, low melting points and densities

Question 7

Horizontal

Answer 7

period

Question 8

Column

Answer 8

row

Question 9

Dalton’s atomic theory

Answer 9

atoms responsible for combinations of elements in compounds

• all matter made up of atoms
• atoms identical to each other from same element
• neither created nor destroyed

Question 10

JJ Thomson

Answer 10

cathode rays were streams of electrons (discovered electron)

• plum pudding model
• sub particles dispersed in positively charged cloud

Question 11

Ernest Rutherford

Answer 11

Ernest Rutherford- gold foil experiments

- discovery of the nucleus

Question 12

Standard form of symbol

Answer 12

24/12 Mg (mass over atomic)

Question 13

Isotope symbol

Answer 13

Mg-24

Question 14

Calculating atomic mass

Answer 14

MI1 (%)/100+ MI2(%)/100

Question 15

cation

Answer 15

+, anion -

Question 16

Trend for ionic change

Answer 16

1+, 2+ transition metals varies, 3+, 4+, 3-, 2-, 1-, 0