Periodic table
copper (cu) is often used for electrical wiring and
cooking pans. however, irorl (fe) is much more
common on earth than copper. why might copper
be used instead of iron, if iron is easier to obtain?
a link to the periodic table has been provided for
your use.

Fe has fewer valence electrons than Cu. Fe has a lower conductivity than Cu. The lower conductivity of Fe makes it less useful for wiring and cookware. Fe is less malleable and ductile than Cu. The lower malleability and ductility of Fe make it less easy to form into wires or sheets.

14 days is the half-life of phosphorus-32

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.