A. An element with the valence electron configuration 5s2 would form a monatomic ion with a charge of _.
In order to form this ion, the element will_(lose, gain) _(1-8) electron(s) from/into the ___(s, p,d, f,s+p, s+d, p+d) subshell(s).

B. If an element with the valence configuration 4s2 3d7 loses 2 electron(s), these electron(s)
would be removed from the ___(s, p,d, f,s+p, s+d, p+d)
subshell(s).

answer: mercury

explanation:

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.