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stich3 [128]
3 years ago
11

True or False? Elements in the same row have similar properties. Question 4 options: True False

Chemistry
2 answers:
Natasha2012 [34]3 years ago
6 0
4. false
5. true
6.valence electrons

I took the test
 
Hope this helps.
Gekata [30.6K]3 years ago
3 0

1) Answer is: False.

A period in the periodic table is a horizontal row. For example, sodium and chlorine are in third period and they have very different properties. Sodium is solid metal and chlorine is gaseous nonmetal. Elements in the same row have the same number of electron shells, but different proporties.

2) Answer is: True.

Group is a column of elements in the periodic table. For example, lithium and sodium are in 1 group of the periodic table and they both have one valence electron.

3) Answer is: valence electrons.

For example, electron configuration of oxygen atom: ₈O 1s² 2s² 2p⁴.

Oxygen atom has six valence electrons, so it is in 16 group of Periodic table of elements.


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A mixture of He
aksik [14]

Answer : The partial pressure of nitrogen gas in the mixture is, 9.88 atm

Explanation :

According to the Dalton's Law, the total pressure of the gas is equal to the sum of the partial pressure of individual gases.

Formula used :

p_T=p_{He}+p_{Ar}+p_{N_2}

where,

p_T = total pressure of gas  = 13.6 atm

p_{He} = partial pressure of helium gas  = 1831 torr =  2.41 atm

p_{Ar} = partial pressure of argon gas  = 997 torr =  1.31 atm

Conversion used: (1 atm = 760 torr)

p_{N_2} = partial pressure of nitrogen gas  = ?

Now put all the given values in the above formula, we get:

13.6=2.41+1.31+p_{N_2}

p_{N_2}=9.88atm

Thus, the partial pressure of nitrogen gas in the mixture is, 9.88 atm

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