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,
![+11-11 = 0](https://tex.z-dn.net/?f=%2B11-11%20%3D%200)
. 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,
![12-2=10](https://tex.z-dn.net/?f=12-2%3D10)
Okay, what's the proof? Want it?
We know there are 10 protons and 12 electrons. Let's see it.
![+10-12=-2](https://tex.z-dn.net/?f=%2B10-12%3D-2)
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.
Answer:
Acoustic instruments, Electrical instruments, Living beings like animals and birds using their vocal cords, Man-made sources like machines, any vibration caused by wind are five sources of sound.
ok Explanation:
Answer:
A unit of mass used to express atomic and molecular weights, equal to one-twelfth of the mass of an atom of carbon-12. It is equal to approximately 1.66 x 10-27 kg.
Explanation:
Mendeleev left gaps in his periodic tables suggesting that there were other elements to be found.
Answer:
Explanation:
how many grams and moles of gold are present in 8.09 x 10^28 atoms of gold?
there are 6.02 x 10^23 molecules or atoms in 1 mole
of a compound or element
8.09 x 10^28 /(6.02 x 10^23) = 1.34 x 10^5 moles of Au
1 mole of gold (see periodic table for #79) 197 g
so 1.34 x 10^5 moles of Au weigh
197 x 1.34 x 10^5 = 2.64 x 10^7 g
your little gold treasure is worth
Gold Price Per Gram $59.87 x 2.64 x 10^7=
$$$$ 1.58 x 10^9
=$ 1,580,000,000