The mass number of 'helium' is
Experiment which suggested that each chemical element is made up of different atoms, was carried out by
'Helium' is a monoatomic gas and its chemical formula is
The ion with a negative charge, is known as
The atomic number of 'oxygen' is
'Radioisotopes' are used to trace
The number of proton in an 'atom' is also known as
The turbines are connected to
'Atom' is a
Protons have
The maximum number of electrons first shell can hold is
Little free space is found between particles in
The valency of 'bromine' is
Electrons are shared in
In medical the most common use of nuclear battery is in
True statement about strength of bonding is
The most common use of 'radioactivity' is
Atoms of similar elements have same
Nucleus consists of
The atomic number of lithium is
An atom of 'hydrogen' has
Protons and neutrons have
The atomic number of 'beryllium' is
Each 'atom' contains
A chemical formula represents
Atoms of an element with same atomic number but having different mass number are known as
The particles that have opposite charges, are
The ionic chemical formula of sodium is
The closer the shell to the nucleus, the
The number of elements discovered yet, is
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