Answer:
Isotopes
Explanation:
Isotopes are the same element with different masses because of the different number of neutrons. Also, the element doesn't change. If we change the protons, the element will change and then it won't be an isotope. Hope it helps!
Answer:
use common sense!........
To trigger a drug-dog alert, the
necessary threshold level would be around 1 to 10 micrograms of methyl
benzoate.
In the 1999 Furton study, it was
stated that it would take 500 milligrams of cocaine in order to emit 1 to 10
micrograms of Methyl Benzoate.
A colorless liquid that is poorly soluble in water is one of
the properties of <span>methyl benzoate.</span>
2. 3H2 + N2 means you have 6 Hs and 2 Ns. NH3 has one N and 3 Hs, so you need 2 NH3s in order to have the 2 and 6 of each that you need on both sides of the reaction.
The traditional calcium atom has twenty protons and twenty electrons making it neutral.
The calcium in the pic is a calcium ion so the number of protons and electrons are not equivalent.
Since it's 2+ that means the ion is positively charged and for that to happen electrons are away.
So 20-2=18
There are 18 electrons
