F4 C4 CHEM (DEVELOPMENT 4.1)

Question 1

who’s the first scientist in the development of periodic table?

how many groups and element?

Answer 1

lavoisier

4 groups and 33 elements

Question 2

who’s the second scientist in the development of periodic table?

classified into trios known as?

Answer 2

dobereiner

triad

Question 3

who’s the third scientist in the development of periodic table?

first & eight element has the same chem & phy properties (which law)?

Answer 3

newlands

law of octaves

Question 4

who’s the fourth scientist in the development of periodic table?

what he did with the graph?
what against what?

Answer 4

meyer

plot graph
atomic volume against atomic mass

Question 5

who’s the fifth scientist in the development of periodic table?

arranged according?
left spaces for?

Answer 5

mendeleev

arranged by increasing atomic mass
be filled by element yet to discover

Question 6

who’s the last scientist in the development of periodic table?

increasing?

Answer 6

moseley

increasing proton number

Question 7

How many scientist contributed in the development of periodic table?

Answer 7

six scientists

Question 8

What is the basic principle of arrangement of elements?

Answer 8

ascending order of proton number

Question 9

what did moseley do?

Answer 9

he arranged the elements in the periodic table by increasing proton number