<span>In a negative ion, or anion, electron(s) have been added to the atom. This means </span><span>the like charges within the electron cloud are now repelling each other more </span><span>than they were before. The proton count, however, has not changed. So, the </span><span>electron cloud, in response to the added electron(s) expands with that extra </span><span>repulsion. the negative Ions will have gained an electron fill an electron </span><span>shell while a positive Ion will have lost an electron in order to shed its </span><span>outermost shell, thereby making the atom smaller.
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What do you think it is? I'll give you a hint, it's either A or C. Don't guess, just try.
Answer:
1.46L
Explanation:
2Na + 2H2O —> H2 + 2NaOH
Molar Mass of Na = 23g/mol
Mass of Na from the question = 3g
Number of mole of Na = Mass /Molar Mass
Number of mole of Na = 3/23
Number of mole of Na = 0.130mol
From the equation,
2moles of Na produced 1mole of H2.
Therefore, 0.130mol of Na will produce = 0.130/2 = 0.065mol of H2.
Recall: 1mole of a gas occupy 22.4L at stp.
If 1 mole of H2 occupy 22.4L at stp,
Then 0.065mol of H2 will occupy = 0.065 x 22.4 = 1.46L
Ca + H = CaH2
Calcium + Hydrogen = Calcium hydride
Balanced equation :-
Ca + 2H = CaH2
