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1 year ago

Why does atomic radius increase across Period 3?

1 answer:

3 0

An atomic radius decrease across Period 3 because the number of shells not increases but the number of electron increases and the atomic size decreases as the effective nuclear charge increases.

When we move in the period 3 from left to the right the atomic radius decreases because of the reason that the the number of shells don not change they will remain the same across the period but the number of the electron will increases . the effective nuclear charge will also increases. the nucleus will attract the electrons more strongly that the reason the atomic radius decreases.

Thus, number of electron increases and the number of shells will remain same , the atomic size decreases as the effective nuclear charge increases.

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The element lead (pb) consists of four naturally occurring isotopes with atomic masses 203.97302,205.97444,206.97587, n 207.9766

Marina CMI [18]

The method of determining the most common isotope of lead is by determining the average atomic mass. The formula for determining the average atomic mass is:

$average atomic mass = \Sigma {percent abundance}\times {atomic mass}$

Substituting the values in the formula:

$average atomic mass = \frac{{203.97302}\times {1.4}+{205.9744}\times {24.1}+{206.97587}\times {22.1}+{207.97663}\times {52.4}}{100}$

$average atomic mass = \frac{285.562228+4963.984004+4574.166727+10897.975412}{100}$

$average atomic mass = \frac{20721.688371}{100} = 207.22 amu$

The most common isotope of lead is:

Lead - 207.22 amu

The atomic symbol of lead is $Pb$ . The atomic number of $Pb$ is 82.

So, the the most common isotope of lead can be written as:

$_{207.22}^{82}Pb$ and Lead - 207.22 amu.

3 0

3 years ago

Diamonds are measured in carats, and 1 carat=0.200 g. The density of diamond is 3.51 g/cm^3. What is the volume of a 5.0 - carat

Blizzard [7]

Answer:- Volume of the 5.0 carat diamond is $0.28cm^3$ .

Solution:- It is a unit conversion problem. Need to convert carat to grams and then using grams and density the volume could easily be calculated.

We have 5.0 carat diamond and asked to calculate it's volume. Density of diamond is given as $3.51\frac{g}{cm^3}$ and 1 carat = 0.200 g. Let's do this step by step:

First step is the conversion of carat to grams:

$5.0carat(\frac{0.200g}{1carat})$ = 1.0 g

In second step, grams are converted to volume using the given density as:

$volume=\frac{mass}{density}$

$volume=1.0g(\frac{1cm^3}{3.51g})$

$volume=0.28cm^3$

So, the volume of the 5.0 carat diamond is $0.28cm^3$ .

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3 years ago

Which elements does it take to spell "nerds" using the chemical symbols on the Periodic Table of Elements?

Veseljchak [2.6K]

If we looks at the elements and the periodic table . A is correct because Nitrogen is N , Ensteinium is E, Radon is RN, and lastly S is sulfer.

I hope this helps you! :)

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3 years ago

What is the significance of carbon having four valence electrons?

Dmitry_Shevchenko [17]

Answer:

Sorry for the late answer, but it should be A. Carbon's outermost shell can form up to 4 covalent bonds. It's one of the reasons why Carbon is considered an "essential element".

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2 years ago

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vitfil [10]

Answer:

Explanation:

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3 years ago