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Darya [45]
3 years ago
12

In 1869, Mendeleev created a periodic table in which elements were ordered by weight and placed in groups based on their chemica

l properties. Mendeleev's decision to design the periodic table in this way allowed immediate advances in chemistry by.?
A.) Providing an explanation for the reactive properties of the alkali metals
B.) Providing a framework for models of electron configurations
C.) Predicting the existence of a group of undiscovered inert gases
D.) Predicting the properties of undiscovered elements in specific atomic weight ranges.
PLEASE EXPLAIN
Chemistry
2 answers:
ale4655 [162]3 years ago
7 0

Answer:

D

Explanation:

Elements propreties can be undestood by analisying of its electronic configuration, because the way that electrons fill up the orbitals will determine the atomic reactivity.

The periodic table is made in a way that elements with the same electronic configuration are at the same group, so this desing in its early stage were able to predict the properties of undiscovered elements, because of the periodic trends within the periodic table.

RSB [31]3 years ago
6 0
D he predicted 3(?) new element that we're later discovered
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I just started learning about kinetic molecular theory, and I’m not sure how to answer the question circled below
lions [1.4K]

Answer : The value of 'R' is 0.0821\text{ L atm }mol^{-1}K^{-1}

Solution : Given,

At STP conditions,

Pressure = 1 atm

Temperature = 273 K

Number of moles = 1 mole

Volume = 22.4 L

Formula used :     R=\frac{PV}{nT}

where,

R = Gas constant

P = pressure of gas

T = temperature of gas

V = volume of gas

n = number of moles of gas

Now put all the given values in this formula, we get the values of 'R'.

R=\frac{(1atm)\times (22.4L)}{(1mole)\times (273K)}

R=0.0821\text{ L atm }mol^{-1}K^{-1}

Therefore, the value of 'R' is 0.0821\text{ L atm }mol^{-1}K^{-1}.

7 0
3 years ago
Which shows the correct order of steps during the formation of an ionic bond?
IRISSAK [1]

The correct order of steps during the formation of an ionic bond

  • Electrons are transferred
  • Ions form
  • Ions are attracted to each other

<h3>What is Ionic bonding?</h3>

This is the type of bonding which occurs as result of transfer of electrons

and is also regarded as electrovalent bonding.

When the electrons are transferred , ions form which then gets attracted

to each other and results in the formation of a compound.

Read more about Ionic bonding here brainly.com/question/13526463

6 0
2 years ago
A cylindrical tube 13.5 cm high and 4.5 cm in diameter is used to collect blood samples. How many cubic decimeters (dm3) of bloo
Aleks [24]

Answer:

The cylindrical tube can hold 0.215 cubic decimeters of blood.

Explanation:

Diameter of the cylindrical tube = d = 4.5 cm

r = d/2 ,r = 2.25 cm

Height of the cylindrical tube = h = 13.5 cm

Volume of the cylinder = V = \pi r^2h

V=3.14\times (2.25 cm)^2\times 13.5 cm

V=214.6 cm^3=0.2146 dm^3\approx 0.215 dm^3

1 cm^3=0.001 dm^3

The cylindrical tube can hold 0.215 cubic decimeters of blood.

3 0
3 years ago
Problem: Convert 30 cm to mm.<br> Need full process pls help
marta [7]

Answer: 300mm

Explanation:

30cm x (10mm/1cm) x <em>(1mm/1mm)</em> = 300mm

<em>Btw, I'm not sure about the </em><u><em>(1mm/1mm).</em></u>

3 0
3 years ago
WHAT IS A PLACE WHERE BOOKS ARE CLASSIFIED! I NEED HELP!
jasenka [17]

Answer:

From the Online Catalog to the Shelf

Libraries in the United States generally use either the Library of Congress Classification System (LC) or the Dewey Decimal Classification System to organize their books. Most academic libraries use LC, and most public libraries and K-12 school libraries use Dewey.

Explanation:

5 0
3 years ago
Read 2 more answers
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