Answer:
Outer shell is full
Explanation:
The elements represented by the group D are noble gases.
Noble gases have fully filled outer electronic configuration.
He=
Ne=
Ar=
Kr=
...
Answer:
1.42 g/mL
Explanation:
The mass per unit volume is called as density. It is an intensive property and its value doesn't depend upon the amount of a substance.
It is given as,
Density = Mass / Volume
Data Given:
Mass of Liquid + Flask = 163.4 g
Volume of Liquid = 5.98 mL
Mass of empty Flask = 154.9 g
Mass of Liquid = 163.4 g - 154.9 g = 8.5 g
Formula Used:
Density = Mass / Volume
Density = 8.5 g / 5.98 mL
Density = 1.42 g/mL
Answer is Option-3:
<span>C</span>₆H₁₄ (Hexane)<span> and H</span>₂O are immiscible.
Explanation:
Hexane is a chain of six carbon atoms attached to each other in straight chain and hydrogen atoms. All the bonds in this compound are non-polar. Hexane molecules interact with each other through London Dispersion Forces.
While, Water molecules are polar in nature, due to electronegativity difference between Oxygen and Hydrogen atoms the Hydrogen atom is partially positive and Oxygen atom is partially negative. And water molecles interact with each other through hydrogen bonding.
Result:
As we know LIKE DISSOLVES LIKE, so both Hexane and water are different from each other, so when mixed together thay fail to develop interactions with each other, Hence immiscible in each other.
The true about element in period or horizontal row of periodic table is
Each element has one more outer electron than the element before it. (answer B)
<u><em> Explanation</em></u>
In periodic table there are four horizontal rows(periods) that is period 1,2,3 and 4.
Across the period each element has one more electron than element before it.
For example Na and Mg which are in periodic 3.
Na has 2.8.1 or [Ne] 3s¹ electron configuration while Mg has 2.8.2 or [Ne] 3S² electron configuration.
Since Mg has 2 outer electrons while Na has 1 outer electron, Mg has more electron than Na.
Answer:
652.174nm
Explanation:
We need to know that the speed of light never changes. It has a value of 3 × 10^8 m/s.
Given only the frequency, we can find the wavelength by dividing the value of the speed of light by the value of the frequency.
That equals = (3 × 10^8) ÷ ( 4.6 × 10^14) = 0.000000652174 m = 652.174 ÷ 10^-9m = 652.174nm
