Name _____________________________________________________ Group _____________

1.- What group of elements have 7 electrons in its outermost energy level?____________ 5 electrons?___________

2.- An atom of an element has 15 protons, 15 electrons and 16 neutrons. What is the atomic number and the mass number of the element? _____________________________

3.- An isotope with mass number 80 has 10 neutrons more than protons. What element is this? ____________________________

4.- Using the following isotopic notations, which one contains 34 neutrons ?a) 108

47Ag b) 9040 Zr c) 63

29 Cu d) 29992 U

5.- What is the maximum number of electrons that can be present in the 3rd energy level of an atom?__________________ 2nd level? ________________ 5th level? _____________

6.- The quantum number are designated with the letter “n” “l” “m” “s” . Describe each.

7.- How many orbitals does sublevel “d” has?________ “s” __________ “p” __________

8.- The electron configuration for an atom of oxygen with atomic number 8 is :

10.- An element belong to group 2A and period 3. What is the element? _________What is its electron configuration and orbital diagram.

11.- An element has the following electron configuration: 1s2 2s2 2p6 3s2 3p5. This element is found in the group ( family )known as ___________________________

12.- Which group of elements belong to the alkaline earth metals family? ______________Halogens? ________________________ noble gases? ___________________

13.- What group of elements form ions with oxidation number of 2- ? _______________Oxidation number +2 __________________

14.- Describe each of the following rules : Pauli exclusion principle, Hund’s rule, Aufbau diagram

15.- Write the noble gas configuration of strontium and arsenic.

16.- What type of ion and charge will phosphorus form to obtain the octet rule?_______

17.- According to its position in the Periodic Table, what type of ion and charge does Arsenic form? _________________

18.- Write the Lewis structure that represents an atom of nitrogen?

19.- Write the Lewis structure represents a nitride ion?

20.- Write the Lewis structure to represent a molecule with a double and another with a triple bond?

21.- Using electronegativity values, what type of bond is formed between an atom of hydrogen and one atom of sulfur?

22.- What type of bond is formed between an atom of chorine and an atom of lithium?

23.- Compare and contrast the properties of ionic and covalent bonds.

24.- Distinguish between polar and nonpolar bonds. Describe how electronegativity difference is used to classify bonds.

25.- Draw the Lewis structure of CO2 and SCl2 and classify as polar or nonpolar.

26.- Compare the properties of covalent, ionic and metallic compounds.

27.- What is a mole? How is it related with Avogadro´s number?

28.- What is the molar mass of gold? __________Of uranium?____________

Which has more particles: 1 mole of gold or 1 mole of uranium? Explain.

29.- How many moles are in 0.755 g of Magnesium?

29.- How many grams are in 3.15 moles of mercury ?

30.- How many particles are in 0.018 moles of C?

31.- How many grams are there in 5.39 x 10 25 atoms of Ag?

32.- Describe the atomic model proposed by each of the following scientists: Dalton, Thomson, Rutherford, Bohr, Schrodinger. Sketch a model of each.

33.- Distinguish between protons, electrons and neutrons.

34.- Calculate the number of protons, neutrons and electrons in uranium-238.