1. 1. Chlorine reacts with water in the following reaction…
Write an equation to show how Bromine reacts with water.
2. The Na+ ion has a smaller radius than the Ne atom. Explain
why this is so.
3. Why do elements in a given group of the periodic table show
similar chemical properties.
4. What change in charge takes place as a metal loses one or
more electrons.
5. Why do the elements of a given period always follow the
progression of metal to metalloid to nonmetal to noble gas.

2. 1. Chlorine reacts with water in the following reaction…
Write and equation to show how Bromine reacts with
water.
2. The Na+ ion has a smaller radius than the Ne atom.
Explain why this is so.
Even though Na is in period 3 and has a third shell while
Ne is a noble gas in period 2 and only has two shells the
Na+ ion loses its outermost third shell when it loses its
valence electron. The extra proton that sodium has also
serves to pull the two remaining shells in closer.

3. 3. Why do elements in a given group of the periodic
table show similar chemical properties.
Groups share the same chemical characteristics due
to having the same number of valence electrons.
4. What change in charge takes place as a metal loses
one or more electrons.
The metal becomes a positive ion and its ionic radius
decreases.

4. 5. Why do the elements of a given period always follow
the progression of metal to metalloid to nonmetal to
noble gas.
Because as you move from left to write within a
period (increasing atomic number) you pass through
all of the different groups on the table.

5. 1. What are two metalloids that belong to the same group on the
periodic table?
2. Describe one chemical property of Group 1 metals that results from
the atom of each metal having only one valence electron?
3. Element M was obtained from a meteorite sample. Experiments
have determined that the element is a member of Group 2 on the
periodic table.
a. What phase of matter would element M be at STP
b. Explain why the radius of a positive ion of element M is smaller than an
atom of element M.
4. Using information from the periodic table, explain why radium
forms chemical bonds in the same way as calcium does?

6. 1. What are two metalloids that belong to the same
group on the periodic table?
Ge and As (Period 4)
Sb and Te (Period 3)
2. Describe one chemical property of Group 1 metals
that results from the atom of each metal having only
one valence electron?
Highly Reactive, Group 1 metals all become ions with
a +1 charge.

7. 3. Element M was obtained from a meteorite sample.
Experiments have determined that the element is a member
of Group 2 on the periodic table.
a. What phase of matter would element M be at STP
Solid.
b. Explain why the radius of a positive ion of element M is smaller than
an atom of element M.
The radius of positive ions is smaller than the atomic radii because
one or more electrons have been lost.
4. Using information from the periodic table, explain why
radium forms chemical bonds in the same way as calcium
does?
Radium (Ra) and Calcium (Ca) are both Alkali Earth Metals
(Group 2) on the periodic table and elements and each has
two valence electrons therefore there chemical reactivitites
will be similar.