Mass number = protons + neutrons
mass number = 5 + 7
mass number = 12
Here is an image of the periodic table. Hope this helps.
I'm pretty sure all 4 are subatomic particles but if i had to guess i'd be Photons
The answer is: A molecule with a difference in electrical charge between two ends.
Electronegativity (χ) is a property that describes the tendency of an atom to attract a shared pair of electrons.
Atoms with higher electronegativity attracts more electrons towards it, electrons are closer to that atom.
For example fluorine has electronegativity approximately χ = 4 and oxygen χ = 3,5, fluorine attracts electron and he has negative charge and oxygen has positive charge.
