Metalloids — Unit test

Question 5 • GA-GSE Physical Science A

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?

Answer

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.

Explanation

Beryllium and barium are both in Group 2 of the periodic table, so they have similar chemical properties. Their atomic numbers, 4 and 56, are very different, placing them in different periods. Choice B correctly connects their shared group to similar chemical properties and their different periods to their different atomic numbers.

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