How many electrons does one neutrally charged atom of argon (Ar) have?
Required
2 points
2
Question 3
3.
How many neutrons are there in 226Ra? The atomic number of Radium is 88.
Required
2 points
2
Question 4
4.
The table shows the number of each of the three subatomic particles for
four atoms.
Which atoms represent the same element?
Required
2 points
2
Question 5
5.
Read the passage and use the diagram to answer the next one question.
Silicon is the second most abundant element in Earth’s crust. It is used in the electronics industry to manufacture transistors, and in the construction industry to produce concrete and Portland cement.
The following graph shows the relative abundances of the naturally occurring
silicon isotopes.
What could be the estimated atomic mass of Silicon?