Column A Column B
1.
a. Group
2.
b. Period
Groups on the Periodic Table have the same
number of
Periods on the Periodic Table have the same
number of
A column (up and down) on the Periodic Table is
called a -
A row (side to side) on the Periodic Table is
called a -
3.
c. energy levels/orbitals
4.
d. valence electrons

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation: