The atomic number of beryllium (Be) is 4, and the atomic number of barium (Ba) is 56. Which comparison is best supported by this information?

Question

They are in the same group because they have similar atomic masses, but they are in different periods because they have different chemical properties.
They are in the same group because they have similar chemical properties, but they are in different periods because they have very different atomic numbers.
They are in the same group because their atomic numbers are each multiples of four, but they are in different periods because they have different chemical properties.
They are in the same group because they have similar atomic masses, but they are in different periods because they have very different atomic numbers.

Answer 1

The best-supported comparison among the options provided is:

They are in the same group because they have similar chemical properties, but they are in different periods because they have very different atomic numbers.

Explanation:

• Beryllium (Be) and barium (Ba) are both alkaline earth metals and are found in the same group (Group 2) on the periodic table, which means they share similar chemical properties.
• However, they are in different periods: beryllium is in Period 2 while barium is in Period 6, indicating significant differences in their atomic structure and properties due to their different atomic numbers (4 for Be and 56 for Ba).

The other options contain inaccuracies regarding groups, properties, or atomic masses.