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dalvyx [7]
3 years ago
15

What is the trend in electronegativity for elements on the periodic table? It decreases across a period and increases down a gro

up. It decreases across a period and decreases down a group. It increases across a period and increases down a group. It increases across a period and decreases down a group.
Chemistry
2 answers:
lilavasa [31]3 years ago
6 0
It increases across a period and decreases down a group. A good way to remember this is that fluorine is the most electronegative atom, and it's to the top right of the table.
Sergeeva-Olga [200]3 years ago
6 0

Answer : The correct option is, It increases across a period and decreases down a group.

Explanation :

Electronegativity : It is defined as the tendency of an atom or an element in a molecule to attract the shared pair of electrons towards itself.

That means, the higher the electronegativity of atom the higher will be its ability to attract shared electrons.

Electronegativity of the elements increase across a period and decreases down a group.

As moving from left to right in a period or across a period, the electrons are added to the same shell and the nuclear charge increases that means the outer shell electrons become close to the nucleus and thus, ability of elements to attract shared pair of electrons itself increases.

As moving from top to bottom in a group or down a group, the electrons are added to the new shell that means the outer shell electrons become far to the nucleus and thus, ability of elements to attract shared pair of electrons itself decreases.

Hence, the correct option is, It increases across a period and decreases down a group.

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Fe(s) + 2HCl(aq) --> FeCl2(aq) + H2(g)
soldier1979 [14.2K]

Answer:

In the option(A) moles of HCl left are 0.100 moles which is wrong, making the option incorrect.

Explanation:

Fe(s) + 2HCl(aq)\rightarrow  FeCl_2(aq) + H_2(g)


Moles of HCl = n

Molarity of HCl = 1.0M

Volume of HCl solution = 30.0 mL = 0.030 L (1 mL = 0.001L)

Moles=Molarity\times Volume (L)

n=1.0M\times 0.030 L=0.030 mol

Moles of Fe = \frac{0.56 g}{56 g/mol}=0.01 mol

According to recation , 1mol of Fe reacts with 2 mol HCl. Then 0.01 mole of Fe will recat with :

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This means that HCl uis in excess , hence excessive reagent.

Moles of HCl left unreacted :

= 0.030 mol - 0.020 mol = 0.010 mol

But in the option moles of HCl left are 0.100 moles which is wrong, making the option incorrect.

8 0
3 years ago
What is the partial pressure of 0.50 mol Ne gas combined with 1.20 mol Kr gas at a final pressure of 730 torr?
WARRIOR [948]
  The partial pressure  of 0.50  Ne  gas    is   214.71  torr


      calculation

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The partial  pressure  is therefore =   0.50 /1.70  x  730  =  214.71  torr
   
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