Answer:
Detail is given below.
Step-by-step explanation:
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.
Now we will solve the problems:
Nitrogen:
atomic mass = 15 amu
Atomic number = 7
Protons = 7
Electrons = 7
Neutrons = 8
Protons = 23
Neutrons = 29
Atomic mass = 23+29 = 52 amu
Electrons = 23
Atomic number = 23
The given element is vanadium.
Electrons = 30
Atomic mass = 64 amu
Protons = 30
Neutrons = (64-30 = 34)
Atomic number = 30
The given element is zinc.
Atomic mass = 99 amu
Atomic number = 43
Protons = 43
Electrons = 43
Neutrons = 99-43 = 56
The given element is technetium.
Lutetium:
Atomic mass = 176 amu
Atomic number = 71
Protons = 71
Electrons =71
Neutrons = 176-71 = 105
Atomic mass = 224 amu
Atomic number = 87
Protons = 87
Electrons = 87
Neutrons = 224-87 = 137
The given element is francium.
Atomic number = 101
Neutrons = 157
Protons = 101
Atomic mass = 101 + 157 = 258 amu
Electrons = 101
The given element is mendelevium.
Atomic mass = 155 amu
Atomic number = 64
Neutrons = 155-64 = 91
Protons = 64
Electrons = 64
The given element is gadolinium.
Atomic mass = 157 + 102 = 259 amu
Atomic number = 102
Neutrons = 157
Protons = 102
Electrons = 102
The given element is nobelium.
Atomic mass = 62 + 88= 150 amu
Atomic number = 62
Neutrons = 88
Protons = 62
Electrons = 62
The given element is samarium.