Question

Part B Complete the sentence indicating the number of protons and electrons in the given ion. Match the numbers in the left column to the appropriate blanks in the sentences on the right. View Available Hint(s) Reset Help 6 The ion O has 7 protons and 8 electrons 9 10 11 16 17 18 Submit Part C What isotope has 14 protons and 15 neutrons? Enter the name of the element followed by a hyphen and the mass number (e.g., uranium- 23 4). View Available Hint(s) Submit -Part D Which element does X represent in the following expression: 2X? Enter the chemical symbol of the element. View Available Hint(s) X is the element symbol

Answer 1

B)
Atomic number of O is 8
So, number of protons = 8

Now use:
charge = number of protons - number of electrons
-2 = 8 - number of electrons
number of electrons = 10
Answer: 8, 10

C)
Mass number = number of protons + number of neutrons
= 14 + 15
= 29

Atomic numer = number of proton = 14
Atomic number is 14 for Silicon

Answer: Silicon-29

D)
Atomic number of X is 12
This is atomic number of Magnesium (Mg)
Answer: Mg