Chemistry, 04.08.2019 14:30 whatsupp123

Is potassium (k) more similar to rubidium (rb) or calcium (ca)? why? a: calcium because it has one more proton than potassium while rubidium has 18 more protons than potassium. b: rubidium because they have the same number of valence electrons c: calcium because it has one more valence electron than potassium d: rubidium because they have the same number of electrons.

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option B: Rubidium because they have the same number of valence electrons.

Explanation:

Potassium and Rubidium are both alkayne metals. They belong to the group 1 of the periodic table and, hence, have the same number of valence electrons, while Calcium belongs to the group 2.

Remember that the elements are grouped in the periodic table according their properties. Elements in the same group have similar properties.

The similarity of the elements in the same group of the periodic table is explained by having the same number of valence electrons, as it is the valence electrons what determines the formation of chemical bonds and so many chemical and physical properties.

Potassium and cesium have 1 valence electron each, while calcium has 2 valence electrons.

Answer from: Quest

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

Answer from: Quest

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

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