The question is incomplete, the complete question is;
Which statement correctly compares the number of protons and electrons in atoms of rubidium (Rb) and calcium (Ca)?
Rubidium has fewer protons and fewer electrons than calcium.
Rubidium has fewer protons and more electrons than calcium.
Rubidium has more protons and fewer electrons than calcium.
Rubidium has more protons and more electrons than calcium.
Rubidium has 37 electrons and protons as well as 48 neutrons. Calcium has 20 electrons, protons and neutrons.
Rubidium is a group 1 element while calcium is a group 2 element. Rubidium has more protons and more electrons than calcium.
Rubidium is an element in group one of the periodic table. It has 37 electrons and protons as well as 48 neutrons.
Calcium is an element in group two of the periodic table. It has Calcium has 20 electrons, protons and neutrons.
From the foregoing, we can see that Rubidium has more protons and more electrons than calcium hence the answer.
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