Which of the following corresponds to an alpha particle? A. A helium nucleus, with an atomic number of 1 and an atomic
mass of 2
O B. A hydrogen nucleus, with an atomic number of 1 and an atomic
mass of 1
C. A helium nucleus, with an atomic number of 2 and an atomic
mass of 2
D. A helium nucleus, with an atomic number of 2 and an atomic mass
of 4

Atomic number=No. of protons=No. of electrons in ground state(unchanged atom)

Atomic number=13=No. of protons

Atomic mass=no. of protons+no. of neutrons=13+14=27

For isotope no. of proton=13(same atomic number but different mass number are isotopes)

no. of electrons=13

no. of neutrons=14+2=16

Explanation:

hope it's help you

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante