Hel Subshell electronic configuration of some elements are given

( symbols are not real)
A - [Ne] 3s 1
B - [Ar] 4s 2
C - [Ar] 3d 6 4s 2
D - [Ne] 3s 2 3p 4
a .What is the atomic number of B?
b . Which among the above has the highest electronegativity ?
c .Which of the above elements form coloured compound?

Monkeys and bats have similar bone structure in their forelimbs. however, monkeys have longer forelimbs to use for climbing and swinging in trees. bats have shorter forelimbs to use for flight. which term best describes how monkey and bat forelimbs are related to each other? a. homologous b. embryonic c. analogous d. vestigial

Acurium-245 nucleus is hit with a neutron and changes as shown by the equation. complete the equation by filling in the missing parts. 52

If a sample of radioactive isotopes takes 600 minutes to decay from 400 grams to 50 grams, what is the half-life of the isotope?