Asap!
when a radioactive isotope releases an alpha particle, the atomic number of the atom is
a
decreased by two.

b
decreased by four.

c
increased by two.

d
increased by four.

Write a net ionic equation to show that hydrofluoric acid, behaves as an acid in water.

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?

How many moles are in 123.0 grams of kclo4?