Chem 5AB Quiz

Question 1

Lavosier

Answer 1

Published a list of 30 substances that he called elements
Some of his elements were actually compounds

Question 2

Dobereiner

Answer 2

Triads: Groups of 3 elements that shared similar properties
Some became tetrads and pentads
Periodicity- Patterns between elements

Question 3

Law of octaves (Newlands)

Answer 3

Connection with atomic mass and chemical properties

Question 4

Mendeleev

Answer 4

Elements arranged by atomic masses
Knew elements not yet discovered
Transition metals
Periodic law

Question 5

Newlands

Answer 5

Organized atoms by atomic mass
Used musical and math background
7 columns
Law of octaves (no one accepted idea)

Question 6

Modern periodic law (Henry Moseley)

Answer 6

The square root of the frequency of the x-ray emitted by an atom is proportional to its atomic number

Question 7

Artificial elements

Answer 7

Transuranium elements
Neptunium Plutonium
Products of artificial processes

Question 8

Periodic table is divided into

Answer 8

Groups (columns) and periods rows

Question 9

Left and middle of the table

Answer 9

Metals

Question 10

Right side of the table

Answer 10

Nonmetals

Question 11

Metalloids

Answer 11

Share properties of both metals and nonmetals

Question 12

The lanthanide series and actinide series are put

Answer 12

At the bottom of the table

Question 13

Atomic radius

Answer 13

Measured using x-ray diffraction
Determined by electron cloud

Question 14

More protons

Answer 14

More attraction

Question 15

More attraction

Answer 15

Closer to nucleus

Question 16

More protons

Answer 16

Smaller radii

Question 17

Why the trend of atomic radius

Answer 17

Going down a group of family add extra layer of electrons for each level
Left to right- more protons means more attraction for electrons. Results in the shrinking of atomic radius

Question 18

Ionic radius

Answer 18

Cations are smaller than their parent atoms (got rid of an electron)
Anions are larger than their neutral atoms (picked up electron)

Question 19

Ionization energy

Answer 19

The energy needed to remove an electron from an atom

Question 20

Dalton

Answer 20

Documented 60 element
Complex symbol system

Question 21

Groups

Answer 21

Same # of valence electrons

Question 22

Periods

Answer 22

Rows- same # of electron orbitals/sublevels

Question 23

Periodic law (Mendeleev)

Answer 23

Properties of elements vary with their atomic number in a periodic way (there is a pattern)
When elements are arranged according to increasing atomic mass there is a repetition in their properties