Answer:
I'll help you in the comments section.
Explanation:
You forgot to take a picture of the question.
Hope that this helped? lol
Italian immigrants chose to move cities because labor was needed and wages were relatively high, and they were particularly likely to take heavy construction jobs.
~I got 100% on this question, right answer guaranteed! :))
Answer:
no. of protons = 39
atomic number = number of protons = 39
number of neutrons = 51
element is Yttrium
Explanation:
given data:
number of electron is 39
mass of atom is 90
We know that atoms are neutral because +ve charged protons is equal to no of -ve charged electrons.
we know that:
atomic number is equal to number of protons,
and atomic mass is the summation of no. of protons and no. of neutrons
number of protons = number of electrons
from the data given:
a) No. of protons = 39 (since number of electrons = protons)
b) atomic number = number of protons = 39
c) number of neutrons = atomic mass - atomic number
= 90 - 39
= 51
d) element is Yttrium
When you simplify this since it is a negative being square rooted it equals 14i
