Answer: B) It presents the correct sequence of events in Earth’s history.
Explanation: edge 2021
Mass of electrons are not included when calculating the atomic mass of element. Atomic mass of the element is equal to proton + neurons. Example the the mass number of Nitrogen can be calculated as 7 protons + 7 neutrons to give 14 . thus nitrogen has a mass number of 14
Answer:
the number of molecules in 7g nitrogen
Ans) 7 gram of Nitrogen contains 1.5×10^23 molecules =1.5e+23
How strong the bonds are between the atoms
Mass number (A) =protons (p+) + neutrons(n°)
