Answer:
See explanation
Explanation:
Ne is a noble gas. It already has an octet of electrons hence, the electron affinity of neon is negative.
Br is a halogen, halogens need one electron to complete their octet. The electron affinity for bromine is negative.
Sodium is a metal that has only one electron in its outermost shell. The electron affinity of sodium is positive.
Magnesium is a metal having two electrons in its outermost shell. The electron affinity of magnesium is positive.
Chlorine is another halogen, energy is released when an electron is added to chlorine hence the electron affinity of chlorine is negative.
Answer:
(NH4)2SO4
Explanation:
2NH3(aq) + H2SO4 (aq) ---> (NH4)2SO4(aq)
Ammonia reacts with sulfuric acid to give the fertilizer ammonium sulfate.
There are 1.16x10²² sulfide <em>ions </em>(S²⁻) in 15 dg of sodium sulfide (Na₂S).
The equation for sodium sulfide is the following:
Na₂S → 2Na⁺ + S²⁻ (1)
So from equation (1), we can see that in<u> 1 mol</u> of <em>sodium sulfide</em> we have <u>1 mol</u> of <em>sulfide ions</em> and 2 moles of sodium ions.
First, let's find the number of moles of<em> Na₂S</em>
(2)
Where:
: is the mass of Na₂S = 15 dg = 1.5 g
: is the molar mass of Na₂S = 78.0452 g/mol
The <em>number of moles</em> of Na₂S is (eq 2):
We can find the number of ions of S²⁻ with Avogadro's number, knowing that the number of moles of Na₂S is equal to the number of moles of S²⁻ (eq 1).
Therefore, there are 1.16x10²² sulfide <em>ions </em>in 15 dg of sodium sulfide.
Find more about Avogadro's number here:
I hope it helps you!
Answer:
Li(s) + H20(l) --> LiOH(aq) + H(g)
Explanation:
it is already balanced
Well, it has 10 protons.
For, a atom in its neutral state has the same number of protons as electrons. Thatswhy, it has a neutral charge. The protons have a positive charge (1+); the elctrons have a negative charge(1-). So, the charges cancel out. Like, a atom has 11 electrons and 11 protons. See-
11 e- = -11
11 p+ = +11
Then,
. So, no charge. Its neutral. It happens in case of every atom.
And, if an atom has (2-) charge that means it has two extra electrons. Two more electron than the number of protons. It once had the same
number of protons and electrons. Then two more electrons give it a (2-) charge.
Thatswhy, if we subtract 2 from 12, we can get the number of protons.We can calculate the number of protons as,
Okay, what's the proof? Want it?
We know there are 10 protons and 12 electrons. Let's see it.
Eureka! That's it. I got it. It's right.
AND ANOTHER QUESTION ARISES,
If all atoms have the same number of protons and electrons then, when does the number of electron decrease or increase? How do the atoms come to have positive or negative charge?
Well, this happens because of ionic bonding. I can't explain all these stuff, right here. To obtain more information on bonding, search it on GOOGLE.