you know that two atoms are the same element if they have the same atomic number,
aka number of protons in the nucleus.
Two atoms of the same element and mass number.
The masses of any two atoms of the same element are not always the same. Atomic mass (the mass you see on the periodic table) is just a weighted average of all of the weights of all of the different isotopes of an element.
Covalent. There is no electronegativity difference between two atoms of the same element.
when you have two different forms of an atom with different masses, it's called an isotope of the atom.
Iodine, I2 is an diatomic element, with two atoms in the molecule.
The number of protons.
They would have to be atoms of the same element, and the same isotope of that element.
Yes. If two atoms have the same number of protons then by definition they are the same element.
Because there is no difference in the electronegativity between the two atoms as they are atoms of the same element and the electron pair is equally shared in the bond.
Two atoms of same element (for a given isotope) are identical and hence have the same atomic radius.
The number of protons, and therefore their atomic number. Also -of coarse- the number of electrons of these two atoms are the same.
Yes. The number of protons defines the element.
element
Molecule
Diatomic
yes
The number of Neutrons -Apex