Atomic number = number of protons and number of protons = number of electrons. So can we say that atomic number = number of electrons
Which of the following statement is correct about the atom of an element ?
(a) an atom can have only protons and neutrons but no electrons.
(b) an atom can have only electrons and neutrons but no protons
(c) an atom can have only electron and proton but no neutron
(d) an atom must always have a proton, neutron and electron
If an atom A has a mass number 'x' and atomic number 'y' ( Axy ) and it forms an ion A− by losing an electron. What can we say about the mass number of the ion?