Oxygen and sulfur are very differnet elements, in that one is a colorless gas an

Question

Oxygen and sulfur are very differnet elements, in that one is a colorless gas and the other is a yellow crystalline solid. Why then are they both in group 6a?

describe the variation in atomic size-- across a period and down a group

How does the atomic radius for a metal atom relate to the reactivity of the metal?

Write the symbols of the halogen family in the order of increasing size of their atoms

Draw the lewis dot symbols for Be, Cl, K, As, and Kr

Give the number of valence electrons for each of the following

a. Ba

B Al

C. P

D. Se

E. Br

F. K

Identifiying each of the following elements as either a metal, nonmetal, metalloid

a. nitrogen

b. arsenic

c. argon

d. calicum

e. uranium

Write the Bohr electron notation for atoms of the elements sodium through argon.

Bromine- atomic number? Mass number? NO. of Protons? No. of Neturons? NO of electrons

boron-11-- atomic number? Mass number? No of protons? No. olf neturons? No of electrons

Cl atomic number? Mass number? NO of protons? No of neturons? No of electrons

Cr atomic number? Mass number? No of protons? No of neturons? No of electrons

Ni-60 atomic number? Mass number? No of protons? No of neturons? No of electrons

Sr-90 atomic number? Mass number? No of protons? No of neturons? No of electrons

Lead-206 atomic number? Mass no? No of protons? No of neturons? No of electrons

what number is most important an identifying an atom

which of the following paris are isotopes? Exlpain your answers

a. 50Ti and 50V

b. 12C and 14C

c. 40Ar and 40 K

What is meant by the term subatomic particles? Give two examples

Explanation / Answer

1) Oxygen and Sulfur have the same outer electron arrangement, and will chemically react similarly with other elements.

2) Moving from left to right across a period, the atomic radius decreases. The atomic radius increases moving down a group.

3) As the atomic radius increase, the distance between nuclei and electron increases and ionization potential decrease, which make the bond between them weaker, so it can loses electrons very easy.

4) F, Cl, Br, I, At

5) Be has two unpaired electrons, Cl has 3 pairs of electrons and 1 unpaired, K has 1 unpaired electron, As has 1 pair of electrons and 3 unpaired electrons, Kr has four pairs of electrons(it is a noble gas)

6)Ba has 2, Al has 3, P has 5, Se has 6, Br has 7, and K has 1

7) N is a nonmetal, As is a nonmetal, Ar is a nonmetal, Ca is a metal, and U is a metalloid

8) Na 2-8-1              Mg 2-8-2                 Al 2-8-3                Si 2-8-4
    P 2-8-5               S 2-8-6                    Cl 2-8-7                Ar 2-8-8

9)Bromine- atomic number 35      Mass number 80 g    Protons = 35 Neturons = 45   Electrons = 35
10)Boron - atomic number 5      Mass number 11 g    Protons = 5 Neturons = 6 Electrons = 5
11)Chlorine atomic number 17      Mass number 35 g    Protons = 17 Neturons = 18 Electrons = 17
12)Cromium - atomic number 24      Mass number 52 g    Protons = 24 Neturons = 28 Electrons = 24
13) Ni-60 - atomic number 28      Mass number 60 g    Protons = 28 Neturons = 32 Electrons = 28
14) Sr-90 - atomic number 38      Mass number 90 g    Protons = 38 Neturons = 52 Electrons = 38
15)Lead-206 - atomic number 82      Mass number 206 g    Protons = 82 Neturons = 124 Electrons = 82
16)atomic number is the most important. It always tells us the number of protons in an element.
17)only B are isotopes. Isotopes are when the elements are the same but the number of neutrons changes
18) electrons and neutrons are subatomic particals. Subatomic just means smaller than an atom, and these are two particals that exist INSIDE the atom. :)

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