Question

The first (ΔiH1) and the second (ΔiH) ionization enthalpies (in kJ mol–1) and the (ΔegH) electron gain enthalpy (in kJ mol–1) of a few elements are given below:

Elements ΔiH ΔiH ΔegH
I 520 7300 –60
II 419 3051 –48
III 1681 3374 –328
IV 1008 1846 –295
V 2372 5251 +48
VI 738 1451 –40
Which of the above elements is likely to be :

(a) the least reactive element.

(b) the most reactive metal.

(c) the most reactive non-metal.

(d) the least reactive non-metal.

Answer 1

@apoorvk Plzz Help!!

Answer 2

Least reactive non metal as it varies with the Characteristics of it

Answer 3

SO....

Answer 4

wat will be the answer lol

Answer 5

Plz with expl ...

Answer 6

How elements are classified in the periodic table?
http://answers.yahoo.com/question/index?qid=20090911022355AA4WTfq

Answer 7

hey u see plzz read my question lol

Answer 8

First my friend u look to it atleast

Answer 9

it is abt ionization energy and electron gain enthalpy

Answer 10

nsdl.niscair.res.in/bitstream/.../revised+periodic+properties.pdf

Answer 11

sorry - long times since i did this stuff

Answer 12

@apoorvk help plzzz

Answer 13

Oh man - just 108 repetitions wouldn't please me I am no God. -.- lol

Answer 14

u r not comminh thats why i am sorry!!!

Answer 15

Lol haha..

anyways.. the most reactive element would require the least energy to get ionised.
Use this funda.

Answer 16

In fact, we had done a similar question here yesterday - why don't you go through it, and reply what you think about this one.

Answer 17

but electron gain enthalpy also given

Answer 18

i tried to answer this my own but that was wrong

Answer 19

@apoorvk r u there

Answer 20

@apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk @apoorvk

Answer 21

Help plzzz

Answer 22

u kno wat ionisation enthalpy is ?

Answer 23

yup the min amt of energy req to remove an electron

Answer 24

well that's ionisation energy..... :P
anyways nd wer do u have a prob solving this problem then?

Answer 25

i need to find those elements

Answer 26

ya ikr.......well wat did u understand after reading the question
wat are ur inferences?

Answer 27

i only knw that electron gain enthalpy of noble gas are positve so element 5 is noble gas

Answer 28

and ionization ener of reactive metals will be low

Answer 29

so which one is it 1 or 2

Answer 30

which one do you think it is?

Answer 31

i think 1

Answer 32

nd y do u think it's 1?

Answer 33

becoz it has first ioni low and second high .........

Answer 34

so?
u got a periodic table?
i suggest u check those values for intial elements of 1a nd elements of 2a............

Answer 35

should be consider low negative electron gain enthalpy for reactive metal

Answer 36

no lol

Answer 37

not by peri o table

Answer 38

check it somehow.................i really dont care how u get those values

Answer 39

Plzzz help

Answer 40

@apoorvk knw s to do by with out looking pt

Answer 41

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Answer 42

can u solve plzzzz

Answer 43

@ujjwal plzzz help

Answer 44

@heena @radar help

Answer 45

@timo86m

Answer 46

Let me give you a hint for each question

a) You've already answered this one the least reactive element is the one that takes the most energy to remove an electron from the atom. and even more for the second one. Also this element would require energy in order to increase its electron density.

b) This is sort of an opposite question to a) (understand that it doesn't matter if its a non metal or not, generally metallic elements are often more reactive than non metals) its now asking which element has the (fill in the gap) first and second ionization enthalpy. Also its true that for this element to gain another electron would be very easy. There is only on sensible choice that satisfies both conditions.

c) So this is the biggest hint, usually non-metals have first ionization enthalpies of >1000kj/mol but look at elements III and IV (electron gain enthalpy specifically) does something strike you? That should give you a hint what kind of elements they are.

d) If you answered a,b and c this should be the easiest question out of all of them.

Answer 47

did nt understand @apoorvk help

Answer 48

Please read what Wulusi has written above, I don't think I can explain any better than him

Answer 49

i cant understand him

Answer 50

plzzz tell me one by one

Answer 51

@wulusi - please post it 'one-by-one' :P

Answer 52

he is offline lol

Answer 53

@Omniscience

Answer 54

@Yahoo! I am a bit rusty on my chemistry and would have to go and consult a text or online resource before I could give a meaningful answer here. Sorry.