Lithium has an atomic number of 3 amu and an atomic mass of 6.941 amu. Beryllium

Question

Lithium has an atomic number of 3 amu and an atomic mass of 6.941 amu. Beryllium has an atomic number of 4 amu and an atomic mass of
9.012 amu. What are the relative sizes of these two atoms, and why are they different?

Smith has a sealed glass box that contains a beaker of water. The glass box weighs 500 grams, the beaker weighs 150 grams, and there is 80 grams of water in the beaker.

If Smith places a Bunsen burner under the glass box and beaker, the water will begin to boil and evaporate. How much will the sealed glass box weigh after all the water has evaporated?

Lithium has an atomic number of 3 amu and an atomic mass of 6.941 amu. Beryllium has an atomic number of 4 amu and an atomic mass of
9.012 amu. What are the relative sizes of these two atoms, and why are they different?

A. The lithium atom is larger because the fewer the number of protons, the stronger the electrical attraction to the electrons. B. The beryllium atom is smaller because the greater the number of electrons, the stronger the electrical attraction to the nucleus. C. The lithium atom is smaller because the smaller the atomic number, the smaller the atom size. D. The beryllium atom is larger because the greater the atomic mass,
the greater the atom size.

Smith has a sealed glass box that contains a beaker of water. The glass box weighs 500 grams, the beaker weighs 150 grams, and there is 80 grams of water in the beaker.

If Smith places a Bunsen burner under the glass box and beaker, the water will begin to boil and evaporate. How much will the sealed glass box weigh after all the water has evaporated?

A. 410 g B. 570 g C. 650 g D. 730 g

Explanation / Answer

The beryllium atom is smaller because the greater the number of electrons, the stronger the electrical attraction to the nucleus.

2 . 570

B.

The beryllium atom is smaller because the greater the number of electrons, the stronger the electrical attraction to the nucleus.

2 . 570

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