Question
If an element ‘X’ has mass number 11 and it has 6 neutrons, then write its representation.
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Answer
The representation of the given element is ${ }_5^{11} X$.
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Similar questions
A. Write the name of the reaction.
B. Identify the electrophile in it.
C. How is this electrophile generated?
Explain how temperature affects surface tension.
| A group | B group |
| A. Paracetamol | a. Antibiotic |
| B. Chloramphenicol | b. Synthetic detergent |
| C. BHT | c. Soap |
| D. Sodium stearate | d. Antioxidant |
| e. Analgesic |
Study the following tables showing bond enthalpies of single and multiple bonds.
$i.$ Among single bonds, which bond is the strongest?
$ii.$ How is bond enthalpy related to bond strength?
→| Bond | $\triangle _aH/kJ mol^{-1}$ |
| $C-H$ | $400-415$ |
| $N-H$ | $390$ |
| $O-H$ | $460-464$ |
| $C-C$ | $345$ |
| $C-N$ | $290-315$ |
| $C-O$ | $355-380$ |
| $C-Cl$ | $330$ |
| Bond | $\triangle _aH/kJ mol^{-1}$ |
| $C-Br$ | $275$ |
| $O-O$ | $175-184$ |
| $C=C$ | $610-630$ |
| $C≡C$ | $835$ |
| $C=O$ | $724-757$ |
| $C≡N$ | $854$ |
$ii.$ How is bond enthalpy related to bond strength?
What are isotopes?
What is the subshell in which the last electron of the first element in the 6th period enters?
The half-life for radioactive decay of an element X is 140 days. Complete the following flow chart showing decay of 1 g of X.
$\lg \xrightarrow{\text { 140deys }} \square g \xrightarrow{\text { 140dyys }} \square g \xrightarrow{\text { 140days }} \square g \xrightarrow{\text { 140deys }} \square g$
→$\lg \xrightarrow{\text { 140deys }} \square g \xrightarrow{\text { 140dyys }} \square g \xrightarrow{\text { 140days }} \square g \xrightarrow{\text { 140deys }} \square g$
How many monochlorination products are possible for 2-methylbutane ?
Draw their structures and write their IUPAC names.
Draw their structures and write their IUPAC names.
For a chemical equilibrium reaction
$H _{2( g )}+ I _{2( g )} \rightleftharpoons 2 HI _{( g )}$
write an expression for $K _{ p }$ (and relate it to $K _{ C }$ ).
→$H _{2( g )}+ I _{2( g )} \rightleftharpoons 2 HI _{( g )}$
write an expression for $K _{ p }$ (and relate it to $K _{ C }$ ).
Why is $O _2$ molecule paramagnetic?
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