At No(F) + At No(Na) = 20.At No of Calcium = 20.
calcium. 9 protons are in f and 11 are in na. that equals 20. Calcium has the atomic number of 20.
Mass number is the atomic mass of a particular isotope (apex chem 5.3)
number of protons and electrons present in an element is equal to the atomic number of that element while number of neutrons is equal to mass number - atomic number/number of protons/number of electrons.
Atomic number of an element is the number of protons that an atom of an element contains. The atomic weight (the mass of the atom) is measured by not only the mass of the proton(s), but by the mass of the nuetrons and electrons too.
SiCl4+2H3O2= H4SiO4+ 2HCl2 The four next to Cl, the three next to H, the two next to O and every other number to the right of the element should be a small number written on the right bottom corner of the element.... Hope this helps
Most helium has a mass number of 4. The rare 3He isotope has a mass number of 3. The mass number is the integer total of protons and neutrons for a given isotope. For example radioactive carbon-14 has a mass number of 14, while carbon-12 (the most common stable form) has a mass number of 12.
There is no element whose symbol is An.
Calcium(C)
Calcium=Ca=Atomic number 20 9+11=20
Calcium
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.