Answer:
none of them are equal to one mole
It's the rows. They are periods. (1,2,3,4,5,6,7 - the ones without the letters).
It's most natural state has a charge of -2. So, a negative ion with two more electrons than is normal.
Answer:
Give any two application for isotopes
Isotopes of iodine are used for radiotherapy in treatment of hyperthyroidism, cancer, etc.
Uranium, Radium, Polonium isotopes are used in atomic reactors.
Cobalt isotopes are used for irradiation of food products.
Answer:
oxygen, water and sugar are the out come of photosynthesis
