1.Nuclear charge decreases as the atomic number increases.Immersive Reader
Answer - True
2.In alkali metals, the atomic radius of potassium is greater than
Answer - Lithium
3.While moving across the periodic table from left to right there is an increase in atomic radius.
Answer - False
4.When moving from gold to lead, the atomic radius increases.
Answer - True
5.The picometer is the unit used to measure atomic radii.
Answer - True
6.Which of the following is larger in atomic size?
Answer - Boron
7.Chlorine has a larger atomic radius than fluorine.
Answer - True
8.Atomic size increases across a period.
Answer - False
9.The atomic radius of a nitrogen atom is 70 pm. What is the distance between the nuclei of two bonded nitrogen atoms in a N2 molecule
Answer - 140 pm
10.Arrange the following atoms in order of decreasing atomic radius:
Ga, As, Sn, Sb, Te
Answer - a. Sn, Sb, Te, Ga, As
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The balanced reaction is:
<span>4 Al + 3 O2
--> 2 Al2O3</span>
Each Aluminum atom wants to lose 3 electrons to become
isoelectronic with Oxygen. Each Oxygen on the other hand wants to gain 2
electrons. Since the reaction shows 6 Oxygen atoms in the product and each want
to gain 2 electrons, therefore a total of 12 electrons are transferred. Since
the problem ask for the electrons transferred per formula unit, hence:
<span>6 electrons (ANSWER)</span>
Answer:
CO2; H2SO4; NaCl
Explanation:
Compounds are substances containing different elements!
since F2 and N2 only has the element flourine ; nitrogen
Answer : The chemical symbol for this element is, (La)
Explanation : Given,
Mass of 
= 0.760 g
Mass of 
= 1.610 g
The given chemical reaction is:
First we have to calculate the moles of and .
Molar mass of Cl = 35.5 g/mole
Let the molar mass of element 'X' be, M
![\text{Moles of }XCl_3=\frac{0.760}{[M+3(35.5)]}](https://tex.z-dn.net/?f=%5Ctext%7BMoles%20of%20%7DXCl_3%3D%5Cfrac%7B0.760%7D%7B%5BM%2B3%2835.5%29%5D%7D)
and,
Molar mass of I = 126.9 g/mole
Let the molar mass of element 'X' be, M
![\text{Moles of }XI_3=\frac{1.610}{[M+3(126.9)]}](https://tex.z-dn.net/?f=%5Ctext%7BMoles%20of%20%7DXI_3%3D%5Cfrac%7B1.610%7D%7B%5BM%2B3%28126.9%29%5D%7D)
From the balanced chemical reaction we conclude that,
The moles of ratio of and is, 1 : 1
That means,
![\frac{0.760}{[M+3(35.5)]}=\frac{1.610}{[M+3(126.9)]}](https://tex.z-dn.net/?f=%5Cfrac%7B0.760%7D%7B%5BM%2B3%2835.5%29%5D%7D%3D%5Cfrac%7B1.610%7D%7B%5BM%2B3%28126.9%29%5D%7D)
![\frac{0.760}{[M+106.5]}=\frac{1.610}{[M+380.7]}](https://tex.z-dn.net/?f=%5Cfrac%7B0.760%7D%7B%5BM%2B106.5%5D%7D%3D%5Cfrac%7B1.610%7D%7B%5BM%2B380.7%5D%7D)
From this we conclude that the element (X) is lanthanum (La) that has molecular weight, 138.667 g/mol.
Hence, the chemical symbol for this element is, (La)
Answer : The technology that can make coal a cleaner fuel is to use lower quality of coal with high sulfur content.
Explanation : Using lower quality of coal with high amount of sulfur in it can make coal a cleaner fuel because of high amount of sulfur it will have better combustion.
