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If the relative mass of a proton is 1, what is the relative mass of a neutron?
What is the mass number of an atom?
The number of electrons and protons in the atom
The number of neutrons and protons in the atom
The number of neutrons in the atom
What is the atomic number of an atom?
The number of atoms it contains
The number of protons it contains
The number of neutrons it contains
Isotopes of an element have:
The same number of protons
The same number of neutrons
Different chemical properties
If the Ar of C is 12 and the Ar of O is 16, what is the Mr of CO2?
If the Ar of H is 1, the Ar of O is 16 and the Ar of Ca is 40, what is the Mr of Ca(OH)2?
The number of grams equal to the Mr of a substance is:
If an isotope of sodium has 11 protons and 13 neutrons:
Its atomic number is 13
Its mass number is 11
Its mass number is 24
If an atom has a mass number of 27 and an atomic number of 13:
It has 14 electrons
It has 14 neutrons
It has 13 neutrons
The atom that the masses of other atoms is compared with is: