questions 8-11

QUESTION 8 The total number of electrons in any silicon atom (SD) is 16. O True O False QUESTION 9 A4.05.g sample of a compound contains 83.02% potassium and 16.98% oxygen. Calculate the mass of potassium present, O 3.36g O 0.69 0 O 2.259 O 1.050 O 3.940 QUESTION 10 Which element has atoms with average mass about 5 times those of the average oxygen atom? OZE Ca OBr O Ar QUESTION 11 What is the symbol for antimony