CHEM

Question 1

Tabular arrangement of the elements in order of increasing atomic number such that elements having similar chemical properties are positioned in vertical columns

Answer 1

Periodic table

Question 2

states that when elements are arranged in order of increasing atomic number, elements with similar chemical properties occur at periodic intervals

Answer 2

Periodic law

Question 3

Proposed a system of chemical symbols based on the first letter of their name and some based on their latin name

Answer 3

Jons Jakob Berzelius

Question 4

arranged the element into groups of simble substances that do not decompose by any means

Answer 4

Antoine Lavoiser

Question 5

made ea list of elements arranged by increasing atomic weight in spiral order

Answer 5

A.E beguyer de Chancourtois

Question 6

He classified some elements into groups of three, which he called triads
- The element in triads had similar chemical properties and order;u physical properties

Answer 6

Johann Dobereiner

Question 7

He suggested that elements be arranged in octaves because he noticed arranging the elements in order of increasing atomic mass) that certain properties repeated every after 8th element

Answer 7

John Newlands

Question 8

arrange the elements according to its atomic weights mass

Answer 8

Lothar Meyer & Dmitri Mendeleev

Question 9

A British chemist responsible for the arrangement of the periodic table in terms of atomic number

Answer 9

Henry Moseley

Question 10

Horizontal tow of elements in a periodic table

Answer 10

Period

Question 10

Vertical column of elements in the periodic table

Answer 10

group

Question 11

General name for any element in Group IA of the periodic table

Answer 11

Alkali metal

Question 12

General name for any element in Group IIA of the periodic table

Answer 12

Alkaline Earth metal

Question 13

soft shiny metals that readily react with water

Answer 13

Alkali metal

Question 14

soft,shiny metals but they are only moderately reactive towards water

Answer 14

Alkaline Earth metal

Question 15

Group VIIA of the periodic table these are reactive elements that are gasses at room teperature

Answer 15

Halogen

Question 16

Group VIII of the periodic table they are unreactive gasses that undergo few in any chemical reactions

Answer 16

Noble gas

Question 17

is an element that has characteristics properties of luster, thermal conductivity, electrical conductivity and mellability

Answer 17

Metal

Question 18

is an element characterized by the absence of the properties of luster, thermal conductivity, electrical conductivity and malleability

Answer 18

Non Metal

Question 19

metallic apperance but they are brittle and only fair conductors of electricity

Answer 19

Metalloids

Question 20

Chemical element is a measure of the size of its atom usually the neab or typical distance from the nucleus to the boundary of the surrounding cloud of electrons

Answer 20

atomic radius

Question 21

defined as the change in energy of a neutral atom when an Electron is added to the atom to form a negative ion

Answer 21

Electron Affinity