Given the mass of aluminum sulfide
= 21.0 g
Molar mass of = 
Calculating the moles of :
Each mole has 3 mol S.
Each mole S constitutes 
Calculating atoms of S in 0.14 mol :
= 
Answer:
Ⓑ Both plants and animals release energy from glucose/sugar in cellular respiration.
Answer:
The last option
Explanation:
The Bohr model was an attempt to explain atomic hydrogen's spectrum. This was done by establishing energy levels of separate electron orbits in the atom.Thos model was followed by the Schrödinger model.
While the number nuclear protons as given is 34, and therefore we deal with the element selenium, there are 2 more electrons than protons, and therefore this species has an overall
2
−
charge.
We represent this selenide ion as
S
e
2
−
. Do I win 5 pounds?
Z= 34, therefore the atom is selenium
