When elements with four electrons in the outermost shell react chemically ,they

A. Always gain 4 electrons
B. Always lose 4 electrons
C. May lose, gain, or share 4 electrons
D. May lose or gain 4 electrons

b. examine and describe cells

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

yes

ya te ayud espera

the maximum mass of nh3 is nh3 in grams