14\nsilicon\n28.086\natomic # =\natomic mass =\nmass number =\n# of protons =\n# of neutrons =\n# of…
14\nsilicon\n28.086\natomic # =\natomic mass =\nmass number =\n# of protons =\n# of neutrons =\n# of electrons =
Answer
Explanation:
Step1: Identify atomic number
The atomic number is the number at the top of the element box. So for silicon, the atomic number is 14.
Step2: Identify atomic mass
The atomic mass is the number at the bottom of the element box. For silicon, it is 28.086.
Step3: Determine mass number
The mass number is the whole - number approximation of the atomic mass. Rounding 28.086 gives 28.
Step4: Recall proton number
The number of protons is equal to the atomic number. So silicon has 14 protons.
Step5: Calculate neutron number
The number of neutrons = mass number - number of protons. So 28 - 14 = 14 neutrons.
Step6: Determine electron number
In a neutral atom, the number of electrons is equal to the number of protons. So silicon has 14 electrons.
Answer:
Atomic # = 14 Atomic Mass = 28.086 Mass Number = 28