Question

please answer me correct did you don't know the answer didn't write the answer​

Answer 1

Answer:

it is aluminum

Explanation:

a, 1s2 2s2 2p6 3s2 3p1

b, 3rd period and 13th or 3a group

c, it the element with atomic number 31

Answer 2

Answer:

a) In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals.

so the electronic configuration of the following elemt will be

K L M

2 8 3

electronic conf. - 2,8,3

b) as the outter most shell have 3 electron so we have to add 10 for finding group

group = 3 + 10 = 13

period = 3 (as there are 3 shell in the element)

c) the element in grouo 13 and period 3 is aluminum so the element which will lie in the same group and avove that will be boron with atomic no. 5

electronic confg.

K L

2,3

electronic config. of boron is 2,3

tips:

• please try to give reason in short
• be specific in answering
• and learn the periodic table till atomic no. 20 i.e, calcium