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A potassium atom has 19 protons and 19 electrons, plus 20-22 neutrons.

A rubidium atom has 37 protons and 37 electrons, plus 46-50 neutrons and so is bigger.

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โˆ™ 2013-02-17 20:18:54
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Q: Why does Rb have a greater atomic radius than K?
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Related Questions

What atomic radius is larger Rb or Sr?

Rb


What is the atomic radius of Rb?

Rubidium has an atomic radius of 248 picometers.


Which has the smallest radius K Rb K Rb?

Potassium's atomic radius is smaller than rubidium's because potassium has fewer energy levels of electrons.


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Out of Li K Na Rb which has the smallest atomic radius?

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Which element has the largest radius Rb 37 or Xe 54?

Rubidium's atomic radius is greater than xenon's because the trend for atomic radius is that it decreases left to right across a period (even though atomic number increases, and generally speaking, atomic mass does as well.) This is a result of the attraction between the protons in the nucleus and the valence electrons, which are all in the same energy level for isoperiodic elements.


Smallest to largest atomic radius PotassiumMagnesiumCalciumRubidium?

mg, ca,k ,rb magnesium, calcium, potassium, rubidium as you do down a group atomic radius increases as you go across a period atomic radius decreases


What elements have a smaller atomic radius than strontium?

Ca, Mg, Be, Fr, Cs, Rb, K, Na, Li, H


Which family has the largest atomic radii?

Several alkali metals (K, Rb, Cs) have a big atomic radius.


What is the atomic weight of Rb?

85.4678 is the atomic weight of Rb.


Which atom has larger atomic radius Rb or Xe?

Rb is larger with a radius of 248 pm while Xe has one of 130 pm. It follows the trend that radii decrease as you move right across the periodic table.


Which has a larger ionic radius a strontium ion or a rubidium ion?

Both are ions and we should consider the ionic radius, not the atomic radius. Rubidium ion (Rb+) will have a larger IONIC radius than strontium ion (Sr2+). Both ions have the same electronic configuration. But strontium ion has more number of protons in the nucleus. Hence it will have greater force of attraction between the nucleus and the valence electrons, resulting in smaller size.


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Rank these elements in terms of increasing atomic radius?

o,c,mg,rb,cs or ar,p,al,na,k -barbie=] H (smallest) S Si Na Rb (largest)


What is the chemical symbol of rubidium?

The chemical symbol of rubidium is Rb Rb-- atomic # 37, atomic weight 85.87


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What element is in group 1 with 37 protons?

If you look at a periodic table and go to group one, and than the element with an atomic number of 37 it is Rb. The atomic number is the number of protons and electrons. Rb is Rubidium.


Where are atoms with the largest and smallest atomic radii found?

The atoms with the largest atomic radii are found in the lower right side of the periodic table. Smallest atoms are found in the higher left part of the periodic table. He has the smallest atomic radii.


What is the atomic mass of Rb?

Rubidium is a metal element. Atomic mass of it is 85.


What is the atomic number of rubidium?

The atomic number of rubidium (Rb) is 37.The atomic weight of Rb is 85.4678(3) grams per mole.See the Web Links to the left of this answer for a periodic table with more information about this element!


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Covalent radii in picometres are: rubidium (235), potassium (220), calcium (180), magnesium (150), beryllium (105).