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3 years ago

How does the modern periodic table arrange elements?

Chemistry

2 answers:

mash [69]3 years ago

8 0

Answer: The elements are arranged according to the atomic numbers.

Explanation:

Elements in a periodic table are distributed in 7 Periods and 18 Groups.

The elements are distributed on the basis of increasing atomic numbers. They are arranged horizontally with increasing atomic number.

In earlier times, the periodic table was arranged according to average atomic mass which had many anomalies.

When elements are arranged according to atomic numbers, they followed a periodic pattern and thus similar elements can be categorized in the same group.

Thus, in modern periodic table, the elements are arranged according to increasing atomic numbers.

Norma-Jean [14]3 years ago

7 0

The elements are arranged in order of increasing atomic number. Vertical columns(called groups) contain elements with similar properties. Horizontal rows called periods elements with the same number of atomic orbitals(That's why Hydrogen and Helium are separated from the rest of the table).

Hope this helps:)

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I smell onions.

goldenfox [79]

Answer:

Observation

-I smell onions

-My dog weighs 45 pounds

-It is 85 degrees outside today

Predictions

-My dog will bark at the vacuum cleaner

although he has never seen it before

-My mother is going to cook spaghetti for

supper next Tuesday

-It will be a long, hot summer

Explanation:

5 0

3 years ago

Read 2 more answers

Element Q has an atomic number 68. Consider the isotope Q-136 how many protons are in a neutral atom of this isotope?

mote1985 [20]

Answer: 68

Explanation:

Isotopes of an element have same number of protons but different number of neutrons. Which means isotopes of an element have same atomic number but different mass number.

Atomic number is equal to the number of protons or the number of electrons for a neutral atom and is specific to a particular element.

Mass number is the sum of number of protons and the number of neutrons.

Given : atomic number of element Q = 68 = number of protons

Mass number of isotope Q-136 = 136

But as isotopes have same atomic number, the number of protons will be same and hence there are 68 protons are in a neutral atom of this isotope.

7 0

3 years ago

What is meant by Vulcanicity?

scZoUnD [109]

The quality or state of being volcanic.

3 0

2 years ago

The true absorbance for a 1.0 x 10 −5 M solution is 0.7526. If the percentage stray light for a spectrophotometer is 0.56%, calc

Korvikt [17]

Answer:

The percentage deviation is $\Delta M = 1.87$ %

Explanation:

From the question we are told that

The concentration is of the solution is $C = 1.0*10^{-5} M$

The true absorbance A = 0.7526

The percentage of transmittance due to stray light $z = 0.56$ % $=\frac{0.56}{100} = 0.0056$

Generally Absorbance is mathematically represented as

$A = -log T$

Where T is the percentage of true transmittance

Substituting value

$0.7526 = - log T$

$T = 10^{-0.7526}$

$= 0.177$

$= 17.7$ %

The Apparent absorbance is mathematically represented

$A_p = -log (T +z)$

Substituting values

$A_p = -log(0.177 + 0.0056)$

$= -log(0.1826)$

= 0.7385

The percentage by which apparent absorbance deviates from known absorbance is mathematically evaluated as

$\Delta A = \frac{A -A_p}{A} * \frac{100}{1}$

$= \frac{0.7526 - 0.7385}{0.7526} * \frac{100}{1}$

$\Delta A = 1.87$ %

Since Absorbance varies directly with concentration the percentage deviation of the apparent concentration from know concentration is

$\Delta M = 1.87$ %

6 0

3 years ago

Amanda paired with Janice while Deja paired with Eden for a chemistry project. For the Earth science project, Amanda paired with

pashok25 [27]

The chemical reaction that the situation demonstrates would be a double replacement reaction.

In double replacement reactions, the two reactants participating in the reaction are similarly built in terms of their chemical bonds and they exchange ions to form the products of the reaction. Two products are also formed from the two reactants.

It is as opposed to single replacement reactions in which the two reactants are not similar bond-wise. One of the reactants replaces or displaces one of the ions in another reactant.

In this case, the situation can be represented as follows:

Amanda-Janice + Deja-Eden ----> Amanda-Eden + Deja-Janice

Thus, it is a form of double replacement reaction.

More on double replacement reactions can be found here: brainly.com/question/392491?referrer=searchResults

3 0

2 years ago

Read 2 more answers