11 electrons , 11 protons , 12 neutrons.
The electron configuration that represent an excited state for an atom of calcium is 2, 8, 7, 3.
Calcium atom has an atomic number of 20 and its electronic configuration is 2, 8, 8, 2. An atom is said to be in an excited state if it gains energy and move to an higher energy level. For the calcium atom given above, there are 20 electrons which are distributed into four shells. But in the excited state [option 3], one of the 8 electrons in the third shell gains energy and move to the fourth shell. Thus, the number of electrons in the third shell reduced by 1, while the number of electrons in the fourth shell increase by 1.
multiplying terrorist to power 23, divided by 96. Multiplied by 12.7. so this is 76.48
Answer: 86.7 %
Explanation:
To calculate the moles, we use the equation:
a) moles of 
According to stoichiometry :
1 moles of give = 1 mole of 
Thus 0.307 moles give =
of
Mass of 
Therefore, the percent yield for the reaction is, 86.7%
