The helium atom has 2 protons, 2 electrons and 2 neutrons.
What is its atomic number
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Ответ:
Its atomic number is 2, so it has two protons in its nucleus. Its nucleus also contains two neutrons. Since 2 + 2 = 4, we know that the mass number of the helium atom is 4. Finally, the helium atom also contains two electrons since the number of electrons must equal the number of protons.
Explanation:
Brainliest Please???
Ответ:
Pluto is farthest from the sun and hence it receives extremely low energy of sun. The surface temperature of Pluto is about -240 !!!