Question

can anyone tell me about these answer plzz brainlest promises and no sparm answer
que 1
2 and 4

Answer 1

hey dear

here is the answer

firstly I answerd question no 4

alkali metal good reducing agent are as follows

In redox reaction the reducing agent losses electron to the oxidising agent

they are good reducing agent because they have only one electron in its outer most orbital shell


question no 2 answer is

Moving down in a group electronegativity decreses because due to longer distance between the nuclear and valence electron shell

thereby decreasing the atom have less on an attraction of electron proton.


question no 1 answer is

1) Dobernier -
1) this scientists give the three tracids are

lithium, potassium , boron

2) they do not give more tracids of elements so they fail


Mendleev -
1) this scientist said to increase the atomic energy of all the elements

but it is not possible

so they fail

Newland -
1) He gave the laws of octave in 1864

2)He arranged all the elements known at the time table in order to relative atomic mass

3)he placed the elements at the space of 8 shells


hope it helps

thank you