chapter 5 Chemistry

Question 0

1st international congress of chemists agree on method of determining and standardizing atomic mass

Answer 0

1860

Question 1

Organized elements in order of increasing atomic mass found elements has similar properties at regular intervals, elements were than grouped together in families, left empty spaces for elements not yet discovered at his time

Answer 1

Mendeleev

Question 2

Mostly determined atomic numbers for elements and arranged the periodic table according to atomic number

Answer 2

1911

Question 3

The physical and chemical properties of the elements are function of their atomic numbers

Answer 3

Period law

Question 4

Arrangement of elements in order of their atomic numbers so that elements with similar properties fall in the same group

Answer 4

The modern Periodic Table

Question 5

Periods and blocks of the periodic table

Answer 5

Electron configuration and the periodic table

Question 6

Li, Na, K, Rb, Cs, Fr
All soft, silvery metals melting point is greater than boiling point of water one electron in outer shell very reactive (not found free in nature)

Answer 6

Group 1, Alkali Metals

Question 7

All silvery metals but harder and softer than group 1

Answer 7

Group 2 Alkali Earth Metals

Question 8

D block elements

Answer 8

Group 3-12 
Transition elements 
All metals 
Have properties of metals 
Less reactive 
High luster 
Good conductivity

Question 9

P block elements

Answer 9

Groups 13-18
Properties vary
Some non-metals, some metallos, some metals

Question 10

Halogens (F, CL, BR,I, AL)
All non metals
Very reactive 7 electrons in outer shell

Answer 10

Group 17

Question 11

Noble gases
All non metals and gases
8 electrons in outer shell non-reactive

Answer 11

Group 18

Question 12

Lanthanide serious

La=5d, C electrons Lu =4f

Answer 12

F block elements

Question 13

Ac= 6d th - Lr = 5f

Contains radioactive elements, some natural

Answer 13

Actinide Series

Question 14

Decreases across period due to increasing positive charge of the nuclei
Increase down a group due to increasing number of levels

Answer 14

Atomic radii as a periodic property

Question 15

Minimum amount of energy to remove an electron

A+energy – A+electron

Answer 15

Indication Energy

Question 16

Increases across the periods due to increasing nuclei charge
Decrease down the column due to distance from the nucleus

Answer 16

Ionization energy as a periodic property

Question 17

Each successive electron removed from an ion feels an increasingly stronger effective

Nuclear charge – ionization energy increases a large ionization energy increase occurs when one electron is removed from an inner, stable level

Answer 17

Removing electron from positive ions

Question 18

Energy released when an atom acquires an electron A + C – A + energy

Answer 18

Electron Affinity

Question 19

Values become more negative across the

Answer 19

Periods

Question 20

Values become less negative down a

Answer 20

Column

Question 21

• Positive ion

- smaller radius compared to atom due to loss of outer shell electron increased nuclear pull

Answer 21

Ionic Radii

Question 22

Large radius compound to atom due to decreased nuclear pull and INC electron cloud

Answer 22

Anion (negative ion)

Question 23

Numbers of electron in outer shell

Answer 23

Valence Electrons