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4 years ago

Which correctly summarizes the trend in electron affinity?

Chemistry

2 answers:

astra-53 [7]4 years ago

6 0

Answer:

Explanation:

sergij07 [2.7K]4 years ago

5 0

Answer: Option (d) is the correct answer.

Explanation:

The amount of energy released when an electron is added to a neutral atom or ion preset in gaseous phase to form a negative ion then it is known as electron affinity.

As we move across a period, due to the decrease in size of atom there will be increase in electron affinity. And, when we move down a group then there will be decrease in electron affinity.

More positive is the value of electron affinity more readily the atom can gain an electron. And, more negative value of electron affinity means atom will have difficulty in gaining an electron.

Thus, we can conclude that the statement it tends to be more negative down a group correctly summarizes the trend in electron affinity.

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Is electrical conductivity an extensive property or an intensive property?

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4 years ago

Select the correct answer. Elements Electronegativity aluminum (Al) 1.61 calcium (Ca) 1 carbon (C) 2.55 chlorine (Cl) 3.16 fluor

marishachu [46]

Answer: Fe - O

Explanation:

1) Start by showing the chart information in a more understandable way:

Elements ---------- Electronegativity

aluminum (Al) ----- 1.61

calcium (Ca) ------- 1

carbon (C) ---------- 2.55

chlorine (Cl) -------- 3.16

fluorine (F) --------- 4

hydrogen (H) ------ 2.2

iron (Fe) ------------- 1.83

nitrogen (N) --------- 3.04

oxygen (O) ----------- 3.44

phosphorus (P) ----- 2.19

potassium (K) -------- 0.82

silicon (Si) ------------- 1.9

sulfur (S) --------------- 2.58

2) Find the electronegativity differences for the atoms in each compound:

i) Ca – Cl: 3.16 - 1 = 2.16

ii) Fe – O: 3.44 - 1.83 = 1.61

iii) H – S: 2.58 - 2.2 = 0.38

iii= F – F = 4 - 4 = 0

3) Analysis

i) The higher the electronegativity difference between two non-metal elements, the the more the polar the covalent bond. Therefore, the bond H - S is the most polar among the non-metal - non-metal bonds listed. But 0.38 is a small difference, so this is not very polar.

ii) For metal - non-metal bonds, when the difference in electronegativities is too high (close to or greater than 2.0) the ionic character is dominant, and so you cannot classify the bond as polar but as ionic. Therefore, Ca - Cl with 2.16 electronegativity difference is a ionic bond.

iii) The bond in Fe – O has electronegativty difference of 1.61, so it is yet covalent, and highly polar.

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