Question

Mass numbers of Li, Be and B are 7, 9 and
10 respectively. Which of the following has
two electrons, three protons and four
neutrons?
1) B+ 2) Be2+ 3) Lit 4) Be​

Answer 1

Answer:

Li+ will be the right answer

Explanation: as Li HAS 3 ELECTRON

SO Li + would have 2 electrons only

as atomic number no of Li is 3 so number of proton will be 3

and no of neutron is mass number -no of proton

therefore, 7-3=4 so it would have 4 neutron

Answer 2

Answer:

hi dear

ur answer is Li

have a nice day