Chemistry
All isotopes of the same element have ________

The same atomic number but different atomic masses
Different atomic numbers and the same atomic mass
The same atomic number and the atomic mass
Different atomic numbers and different atomic mass

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Chemistry
Sodium vapour lamps glow with yellow colour. This is due to

Its ability to absorb all other colours except yellow
sublimation of sodium to emit yellow colour
The low ionisation energy of sodium
The emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum

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