Atomic number Carbon = 6
14 mass - 6 protons = 8 neutrons
mass (protons+neutrons) - atomic number (protons #) = neutrons #
The minimum amount of energy required to move most loosely bound electron of a isolated neutral gas atom or molecule
To name compounds, usually, they are a combination of a metal and a nonmetal, between nonmetals and between metals. The two elements here are ammonium (NH₄) and sulfur (S). These are both nonmetals. When you name the compound, start by ammonium, followed by sulfur plus a suffix of -ide. The compound is ammonium sulfide.
Selenium (Se)
The covalent polar bond is in compound of carbon and selenium - carbon selenide CSe₂.
Answer:
0.71
Explanation:
The molecular mass of NaCl is, 23+35.5
= 58.5
1 mole means molecular mass (in gram)
In 58.5 gm NaCl there is 1 mole.
So, 42.1 gm NaCl contains 42.1/58.5 =0.71 moles.