Helium has two electrons in the 1s orbital. when it becomes singly ionized, forming he+,

(a) its spectrum resembles that of the hydrogen spectrum.

(b) the remaining electron is easier to remove.

(c) the nuclear charge has decreased by one.

(d) it has lost one atomic mass unit.

that of the hydrogen spectrum.

(A) its spectrum resembles that of the hydrogen spectrum

Explanation:

Hydrogen has only one electron in it's outermost shell. Its spectrum shows only one electron transition. If the spectrum of He+ is measured, it will closely resemble that of hydrogen since it is also a one electron specie. The electron also occupying a 1s orbital as in hydrogen.

calculate how many grams of ammonia can be produced from 4.21 grams of

n2 + 3h2 = 2nh3

my answer:

25.0g n2 x (1 mol/ 28.0gn2) x (2 mol nh3/ 1 mol n2) x (17.0g nh3/ 1 molnh3) = 30.36g n2

25.0g h2 x (1 mol h2/ 2.00g h2) x (2 mol nh3/ 3 mol h2) x (17.0g nh3/ 1 mol nh3) = 141.67g h2

lr = n2

the answer is c

tell me if wrong