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netineya [11]
2 years ago
13

1) Consider this row in the periodic table. What changes can you predict based on what information is provided by the boxes for

each element?
A) The elements change from solids to gases and the valence electrons decrease in number.

B) As you move across the row, the number of electrons increases and reactivity also increases.

C) They have different atomic numbers and mass numbers; they have the same number of valence electrons.

D) Both the atomic numbers and the mass numbers increase; the least reactive element is in the last box.

USA test prep question

Chemistry
1 answer:
bearhunter [10]2 years ago
4 0

Answer:

B) As you move across the row, the number of electrons increases and reactivity also increases.

Explanation:

The periodic table is arranged in a way that if you go across a period, the number of protons, neutrons, and electrons in an element increases. In terms of reactivity, the most reactive elements are the ones which have a high electronegativity. The electronegativity of the elements increases as you travel to the right and upwards on the periodic table.

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<u>Answer 2 :</u> The given electronic configuration for a neutral atom of phosphorous in its ground state is incorrect.

Explanation :

A neutral atom of phosphorous has 15 electrons.

The given electronic configuration is incorrect.

The reason is, According to Aufbau principle, the electrons will be first filled in the sub-shell having lower orbital energy. As from the given configuration, 3p sub-shell has lower orbital energy than 4s sub-shell. So, the electrons will be filled in 3p sub-shell first. Hence, the ground state electronic configuration of neutral atom of phosphorous is,

1s^22s^22p^63s^23p^3

<u>Answer 3 :</u>

Element                     Rubidium              Magnesium                Aluminium

Symbol                             Rb                         Mg                              Al

Group number                  1                             2                               13

Number of valence          1                             2                                3

electrons

The order of general reactivity on the basis of number of valence electrons.

Rb > Mg > Al

Reason : The reactivity is determined by the number of electrons present in the outermost shell that means the element which have 1 valence electron will be more reactive because they can easily lose electrons.

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Answer:

Explanation:

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A chemical reaction is a process that occurs when one or more substances are changed into one or more new substances.

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Physical properties are properties that can be observed without bringing a chemical change.

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