Answer Happy

8. Which statement is not true of the nucleus of an atom? a. it is at the center of an atom b. it contains the neutrons, protons and electrons c. its overall charge is positive d. it contains most of the mass of an atom e. both b and d 9. The number of electrons in a neutral atom of a given element is equal to: a. the mass number b. the atomic number c. the number of protons e. both c and a f. both b and c 10. How many protons, neutrons and electrons are in the isotope of Fe*2 having a mass number of 54? a. 26p, 28n, 25e b. 28p, 26n, 24e 11. Give the isotopic symbol for the element having 41 protons and 43 neutrons_ 12. Which of the following statement(s) is not true of the halogens? a. they are the Group VIIA elements b. they are considered main group elements c. they are nonmetals d. they are metals e. they form positively charged ions f. both d and e c. 26p, 24n, 28e d. 26p, 28n, 24e 13. The formula for sodium oxide is: a. NaO b. Na₂O c. NaO₂ d. Na40₂ Name or give the formula for the following ionic and molecular compounds: 14. beryllium sulfide Fe₂0₁ PCL4 15. 16. 17. potassium carbonate 18. How many moles of Cu are there in 1323 mg of Cu?