Which list of elements is arranged in order of increasing atomic radii?(1) Li, Be, B, C (3) Sc, Ti, V, Cr(2) Sr, Ca, Mg, Be (4) F, Cl, Br, I
Answers
Elements which are arranged in increasing order of atomic radii are F,Cl,Br, I.
What is atomic radius ?
Atomic radius is defined as the distance between nucleus of an atom and the valence electrons.In a group, atomic radii increases up to down as electrons are added in the next successive shell which increases the size of atom.
In a period, as electrons are added to the same shell the force of attraction between nucleus and valence electrons increases as a result of which atom tend to shrink resulting in decrease in atomic size.
As fluorine, chlorine, bromine and iodine are present in the same group their atomic size increases as new shells are added from top to bottom of periodic table., while for the elements given in other options they are present in same period or in different group and hence do not show an gradual increase in atomic radii.
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Answer: F,Cl,Br,l
Explanation:these elements are all part of group 17
Related Questions
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A thesis statement is _____.the subject of your paper the conclusion the statement the writer attempts to prove
You are walking in Paris alongside the Eiffel Tower and suddenly a croissant smacks you on the head and knocks you to the ground. From your handy dandy tourist guidebook you find that the height of the Eiffel Tower is 300.5 m. If you neglect air resistance, calculate how many seconds the croissant dropped before it tagged you on the head.
Which of the following changes will always be true for an exothermic process?+deltaH +deltaS -deltaH -deltaG
first ionization energy
(1) decreases
(2) increases
(3) decreases, then increases
(4) increases, then decreases
Answers
Answer: The first ionization energy for the first five elements of Group 15 decreases.
Explanation:
Ionization energy is defined as the energy required to remove an electron from the outermost shell of an isolated gaseous atom. It is represented as
Ionization energy decreases as we move down the group. This happens because the number of shells increases as we move down the group. The electrons are added in the new shell around the nucleus.
This results in the shielding of outermost electrons more from the inner ones, which decreases the attraction between the outermost electrons and the nucleus. Hence, the removal of electron from the outermost shell becomes easy and requires less energy.
Hence, the first ionization energy for the first five elements of Group 15 decreases.
Answers
Answer:
- 152.8 cm3
Explanation:
We are given that the material of the object is the same as the previous object
In the previous question, we determined the density of the material is 2.5 g/cm3
We are given the mass of this object is 382 g
To find the volume, we can use the equation:
- Mass = Density x Volume
Plugging in the values we know:
- 382 g = (2.5 g/cm3) x Volume
Solving for Volume:
Volume = Mass / Density
- = 382 g / 2.5 g/cm3
- = 152.8 cm3
Answers
Answer:
America was going through a difficult period when Paine wrote "The Crisis, No. 1." Some soldiers were abandoning the fight for freedom, and therefore, Paine tried to convince them through these lines: "These are the times that try men's souls. The summer soldier and the sunshine patriot will, in this crisis, shrink from the service of their country; but he that stands by it now, deserves the love and thanks of man and woman."
Paine agreed that the time was full of troubles and problems, and it was testing the hard work of the people. However, he appealed to them to not abandon the war. He argued that hope was not yet lost, and victory was within reach as long as Americans continued their struggle.
Explanation: answer on plato/edmentum
a. True
b. False
Answers
N2(g) + 3H2(g)2NH3(g)
What is the percentage yield when 60 kg of ammonia is produced from 60 kg of hydrogen?
A
5.9%
B
17.6%
с
35.3%
D
50.0%
Answers
Answer:
B
17.6%
Explanation:
1. Percentage yield = (Actual yield/theoretical yield) x 100
2. You know actual yield of ammonia (60kg) so you need to work out theoretical yield.
3. mols of hydrogen = m/mr = 60,000/2 = 30,000 mols.
4. 3:2 ratio so (30,000/3) x 2 = 20,000 mols of Ammonia.
5. Therefore mass of ammonia = mr x mols = 20,000 x 17 = 340,000 grams
6. So percentage yield is (60,000/340,000) x 100 = 17.6
Answers
Cl₃ is formed by thecombination of 3 chlorine atoms. Hence, not a single element and not a compound. Instead Cl₃ is a molecule of chlorine.
What are molecules ?
Molecules are the combination of atoms of same element or are the basic units of a compound. A compound is formed by the combination of two or more atoms of different elements.
The combination of atoms can be different bond types, such as ionic bond, covalent bond, hydrogen bonding etc. The type of bond is dependent on the nature of atoms.
Combination of same atoms in any number are forming the molecules of that element and not a compound. Hence, Cl₃ is a molecules and not element or compound.
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Answer:
CI3 is a compound called carbon tetra iodide