element questions?

Question

1. what is the heaviest element out of the first 30 elements (excluding the transition metals)?
2. What element is used to make lightweight alloys (magnesium, sulfur, strontium, indium, or tin)?
3. what group/period/or column loses two electrons when they react? gains two electrons?
thanks..its a big help!

Answer 1

1. Excluding transition metals, Calcium (Ca), element 20, which has an atomic mass of 40 amu, is the heaviest of the first 30 elements on the Periodic Table. Zn, Zinc, element number 30 is the heaviest element if we include the transition elements.. Atomic mass increases with atomic number.
2. Tin, a light metal, is used in a number of alloys, which are compunds composed of two or more metals.
3. The rule is that the first two columns lose either one or two electrons. Column (Group) I loses 1 electron, and therefore an element like lithium (Li) is labeled as Li+ (as an ion, not in its regular neutral form), and an element in column (group) II, loses two electrons. Calcium, in column two, loses two electrons and is labeled as Ca2+. Elements in column (Group) 6 gain 2 electrons, and those in column (Group) 7 gain 1. So Oxygen, in column 6, gains 2 electrons. Chlorine, in Group or column 7 gains 1 electron. It is very easy to read columns, but make sure you don't include the elements in the center, below the "gap" in the periodic table. There are nonrepresentative elements and their charges are more tricky to calculate.

Answer 2

Zinc (Zn) is number 30 and has an atomic weight of 65.38. Generally, the higher the number, the greater the atomic weight. The atomic weight is equal to the number of protons (30 in the case of zinc) plus the number of neutrons (about the same as the number of protons, perhaps a few more).

Magnesium (Mg) is often alloyed with iron (Fe) to make a lightweight steel. Tin (Sn) is combined with copper (Cu) to make bronze, but that is done mostly for strength.

Elements on the left of the chart tend to lose electrons, while those on the right tend to gain electrons. Elements in the second group often lose two electrons to become ions: Be++, Mg++, Ca++, while those in Group VI often gain electrons to become ions: O--, S--, Cr--

Answer 3

OK, so its been a year since i've taken HS chemistry, but i do know the 3rd question is the 2nd column from the left loses 2 and the 3rd column from the right gain two.