The element with an atomic number of 4 is helium. Helium is a colorless odorless tasteless non-toxic inert monatomic gas. It is the second lightest element and the second most abundant element in the universe. Helium is most commonly found on Earth as a by-product of natural gas production. It is used in a variety of applications including:
Helium is also used as a coolant in nuclear reactors and MRI machines. It is also used to detect leaks in vacuum systems and pressurized gas systems.
Atomic number is unique. It cannot be same for different elements.
elements are arranged in period 4 according to their atomic number
It contains the symbols, atomic number, atomic name and the real name of the elements.
Beryllium, symbol Be, has the atomic number of 4.
Zirconium(Zr) has an atomic number of 40. It is in Group 4 and Period 5.
Atomic number = number of protons.
The average number of neutrons that a specific element has is equivilent to the element's atomic mass minus the that elements atomic number. For example Helium has 2 neutrons because its atomic mass (4) minus the atomic number (2) is 2.
Since atomic number is the number of protons, an atom with the atomic number of 4 has 4 protons.
If "element 5" in this question means the element with atomic number 5, then all of the elements with atomic numbers 1 through 4 have smaller atomic masses. These elements are hydrogen, helium, lithium, and beryllium.
The last members are bromine (liquid) and krypton (gas).
Number of neutrons = atomic mass - atomic number = 9-4 = 5
The atomic number of Beryllium is 4.