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2 years ago

Why do the chemical properties cycle through each period?

Chemistry

2 answers:

RSB [31]2 years ago

7 0

Answer: Option (d) is the correct answer.

Explanation:

A period is represented by a horizontal line as we move from left to right in a periodic table.

Since, number of electrons keep on adding into the elements while we move in a period. Therefore, number of valence electrons also increases in a period and when the valence shell of last element of a period gets completely filled then the cycle repeats itself.

And elements with same number of valence electrons will show same chemical properties.

Thus, we can conclude that the chemical properties cycle through each period because each period represents a cycle of completing the outer electron shell.

allochka39001 [22]2 years ago

5 0

The correct answer would be the third option. The chemical properties cycle through each period because the atoms' outermost shells having two or more electron shells cannot have more than eight electrons. This is following the octet rule.

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Complete the passage about ionic structures using words from the list

WARRIOR [948]

Answer:

see below

Explanation:

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2 years ago

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Anvisha [2.4K]

Explanation:

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2 years ago

A salt is known to be an alkali metal fluoride. A quick approximate determination of freezing point indicates that 4 g of the sa

nexus9112 [7]

For the answer to the question above, I can't help you directly because I don't have a calculator right now. But I'll show you how to solve this.
use the freezing point depression formula for this one: delta T = i * m * K where K is a constant, m is the molality (mol solute/kg solvent), and i is the van'hoff factor the van hoff factor is the number of ions that your salt dissociates into. Since it's an ALKALI flouride salt, how many ions? k is just a constant, you get it from a table in your textbook somewhere So you have everything to solve for the molality of the solution, once you did that, multiplying it by the mass of water to find the mols of the salt. Take the mass of the salt and divide by this mols to figure out the molar mass, and then compare it with the periodic table to identify the salt.

Mole solute x mass of Water = Mol solute
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then

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2 years ago

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1 year ago

How many valence electrons are in an atom of strontium (Sr)? Consult the periodic table. A. 5 B. 2 C. 47.90 D. 22

Kaylis [27]

The smallest and the basic particle of a chemical element is said to be an atom. It is made up of three subatomic particles that is electrons, protons and neutrons. The neutrons and protons are present in the nucleus of an atom whereas electrons are present in the orbits around the nucleus of the atom. There are several shells in the orbital depending on the atomic number. The electrons which are present in the outermost shell are said to be valence electrons.

They can be determined by the electronic configuration of the element.

The atomic number of strontium, $Sr$ is 38. The electronic configuration of strontium, $Sr$ is:

$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}$

From the electronic configuration it is clear that the outermost shell of strontium, $Sr$ is $5s$ . So, the number of valence electrons in strontium, $Sr$ is 2.

Hence, there are 2 valence electrons in an atom of strontium ( $Sr$ ).

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2 years ago

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