While looking at calcium (ca) on the periodic table, a student needs to find an element with a greater atomic mass in the same period. where should the student look? directly up directly down directly to the left directly to the right

            The Student should look directly to the right.

                  Atomic Mass is defined as, "the total number of protons and neutrons present in the nucleus of an atom".

Trends in Periodic Table:

                                        In Periodic Table the atomic mass increases from left to right along the periods because the atomic number (number of protons) increases from left to right. While, moving from top to bottom along the group the atomic number again increases.

                   In given case we cannot look up because the number of protons will decrease and also the atomic mass. E.g. Atomic mass of Magnesium (above Calcium) is 24.31 amu while that of calcium is 40.08 amu.

                   We can't look directly down because the statement has already specified that we are only allowed to inspect the same period of Calcium (4rth Period).

                   We can't look directly to the left because the atomic mass will decrease. E.g. Potassium with atomic mass 39.10 amu is present to the left of Calcium which has less protons and hence, less atomic mass than Calcium.

the answer for sodium is 0.186

the answer for rubidium is 0.251

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