Chemistry help?

Question

an element is in group 15. the last electron added to an atom of this element will be in a (n)____ sublevel
1.s
2.p
3.c
4.f

transition elements have final electrons in the _____ sublevel.
1.s
2.p
3.d
4.f

an element is most likely to have properties similar to those of_____.

1.another element in the same period
2.another element in the same group
3.a noble gas
4.a transition element

what are the valence electrons in the electron configuration of tin, [Kr]4d¹º5s²5p²?
1.[Kr]
2.4d¹º
3.5s²5p²
4.5p²

Ionic radii____down a group in the periodic table.
1.increase
2.decrease
3.stay the same
4.follow no pattern

a metallic ion is____its corresponding atom.
1.larger than
2.smaller than
3.the same size as
4.impossible to compare with

transition elements, such as chromium, are likely to have_____.
1.an oxidation number of 1+
2.an oxidation number of 2+
3.multiple oxidation numbers
4.a negative oxidation number

Answer 1

2. p

3. d

2. Same group (vertical column)

3. 5s2 5p2

1. Increase

2. Smaller

3. Multiple

Answer 2

Stay in school & do your homework, kids. =]

an element is in group 15. the last electron added to an atom of this element will be in a (n)____ sublevel
2. p
[this is in the p-block of the periodic table, such as nitrogen]

transition elements have final electrons in the _____ sublevel.
3.d
[these are metals]

an element is most likely to have properties similar to those of_____.
2.another element in the same group
[similar electron configuration leads to similar reactivity and chemical properties]

what are the valence electrons in the electron configuration of tin, [Kr]4d¹º5s²5p²?
3.5s²5p²
[outer-most electrons, namely those with n=5 in this case]

Ionic radii____down a group in the periodic table.
1.increase
[Because the electrons are in higher quantum numbers and thus further from the nucleus.]

a metallic ion is____its corresponding atom.
2.smaller than
[fewer electrons]

transition elements, such as chromium, are likely to have_____.
3.multiple oxidation numbers
[due to some interesting phenomenon in electron cofiguration that you learn about in inorganic, but it escapes me at the moment]

Answer 3

1) 2. p orbital
2) 3. d orbital
3) 2. another element in the same group
4) 3. 5s2 5p2
5) 1. increase
6) 2. smaller
7) 3. multiple oxidation numbers