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3 years ago

A neutral isolated atom has a ground state configuration of 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 3 . Identify the element.

Chemistry

1 answer:

Schach [20]3 years ago

5 0

Answer:

Vanadium

Explanation:

There are some inherent properties that can be used to provide identification for elements. Principal amongst these properties atomic number. The atomic number is the number of protons in the nucleus of an atom. It is so relevant that it is the criterion used in fixing elements in their various positions on the periodic table.

However, since electrons are majorly responsible for chemical changes in elements, we need to be able to get the number of electrons. For an electrically neutral atom, the number of electrons is the same as number of protons, this to leave no net positive or negative charge and maintain the elemental neutrality.

Now to get the number of electrons, we simply add everything we have in the configuration in the question. This gives a total of 23 electrons. Thus, we also have 23 protons. Since it’s a ground state configuration, the element here is vanadium

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The sum of the first 10 terms of an arithmetic progression is 120 and the sum of first twenty is 840. find sum of first 30 terms

STatiana [176]

Answer:

The sum of first 30 terms of the arithmetic progression is 2160.

Explanation:

For an arithmetic progression, the sum of first $n$ terms with first term as $a$ and common difference $d$ is given as:

$S_n=\frac{n}{2}(2a+(n-1)d)$

Now, it is given that:

$For\ n=10,S_n=120\\For\ n=20,S_n=840$

Now, plug in these values and frame two equations in $a\ and\ d$

$S_{10}=\frac{10}{2}(2a+(10-1)d)\\120=5(2a+9d)\\2a+9d=\frac{120}{5}\\2a+9d=24------------1$

$S_{20}=\frac{20}{2}(2a+(20-1)d)\\840=10(2a+19d)\\2a+19d=\frac{840}{10}\\2a+19d=84-----------2$

Now, we solve equations (1) and (2) for $a\ and\ d$ . Subtract equation (1) from equation (2). This gives,

$2a+19d-2a-9d=84-24\\19d-9d=60\\10d=60\\d=\frac{60}{10}=6$

Now, plug in the value of $d=6$ in equation (1) and solve for $a$ .

$2a+9(6)=24\\2a+54=24\\2a=24-54\\2a=-30\\a=\frac{-30}{2}=-15$

Plug in the values of $a=-15,\ n=30\ and\ d=6$ in the sum formula to find the sum of first 30 terms.

Now, the sum of first 30 terms is given as:

$S_{30}=\frac{30}{2}(2(-15)+(30-1)(6))\\S_{30}=15(-30+29(6))\\S_{30}=15(-30+174)\\S_{30}=15(144)=2160$

Therefore, the sum of first 30 terms of the arithmetic progression is 2160.

4 0

3 years ago

Which of the following are subatomic particles? Select all that apply.

Viefleur [7K]

Answer:

Protons, Neutrons, and Electrons

Explanation:

About Subatomic particles: Subatomic particles include electrons, the negatively charged, almost massless particles that nevertheless account for most of the size of the atom, and they include the heavier building blocks of the small but very dense nucleus of the atom, the positively charged protons and the electrically neutral neutrons.

3 0

4 years ago

Read 2 more answers

Which element, Sulfur or Chlorine, would have the higher first ionization energy?

Lyrx [107]

Answer:

Chlorine

Explanation:

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3 years ago

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