Calcium=Ca=Atomic number 20
9+11=20
There is no element whose symbol is An.
Calcium(C)
Hydrogen is a non metal element. Atomic number of it is 1.
The number of protons plus the number of electrons isn't a recognized figure in chemistry. The number of protons is the atomic number of an element. The number of electrons is the same as the number of protons except when the element is an ion. An ionic compound results in one or more electrons moving from one element to another element. Although this is a simplification, it can be described as the atom gaining or losing electrons. The number of protons plus the number of neutrons is the atomic weight of an element.
Roughly, the number of neutrons. Note that the atomic mass is only approximately equal to the number of protons plus the number of neutrons - there is a relatively small discrepancy, due to the binding energy.
There is no element whose symbol is An.
Calcium(C)
Calcium
At No(F) + At No(Na) = 20.At No of Calcium = 20.
protons plus neutrons = atomic number
The first four: 1. Be 2. C 3. O 4. Ne How I found this: Since Helium (He) has an atomic number of 2, add two to the atomic number of Be. Since the atomic number of Be is 4, and the atomic number of Helium is 2, you would add four plus two, which equals six. Carbon has an atomic number of six, so therefore it would be your next answer. The formula is the atomic number of Helium plus the atomic number of element you are provided with equals the atomic number of your answer. In simpler terms: atomic number of He+atomic number= atomic number of answer
Number protons + number neutrons is called the mass number or the atomic mass.
Hydrogen is a non metal element. Atomic number of it is 1.
Atomic weight of an element is the number of protons plus neutrons in the nucleus, atomic number is the number of protons only.
It is the same as the number of protons if it is a neutral atom, or the number of protons plus the charge of the ion. The number of protons is the atomic number of the element.
The atomic number is the number of protons in an atom. This number is fixed and determines what element that atom is. The atomic mass is the mass of an atom and is roughly equivalent to the number of protons plus the average number of neutrons that atoms of that particular element.
The one with atomic number 35: bromine.