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MaRussiya [10]
3 years ago
13

Which fact was most likely discovered between the time of Mendeleev’s table and the time of Moseley’s table that helped Moseley

develop his version?
Chemistry
1 answer:
I am Lyosha [343]3 years ago
8 0

Answer:

The number of protons in an atom is different than the atom’s total mass.  

Explanation:

Mendeleev knew only that, with some anomalies, the properties of elements varied periodically with their atomic masses.

Moseley's X-ray experiments enabled him to remove these anomalies and to show that the properties of elements varied with their atomic numbers.  

Chadwick later discovered that the mass differences were caused by the presence of neutrons.

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Explain how the valence electrons are related to the element's period.
AlekseyPX

Answer:

The number of valence electrons in an atom is reflected by its position in the periodic table of the elements (see the periodic table in the Figure below). Across each row, or period, of the periodic table, the number of valence electrons in groups 1–2 and 13–18 increases by one from one element to the next

5 0
2 years ago
What’s the density if the mass is 40.8g and the volume is 60mL?
luda_lava [24]

Answer:

We have the final answer as

<h2>0.68 g/mL</h2>

Explanation:

The density of a substance can be found by using the formula

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

From the question

mass = 40.8 g

volume = 60 mL

The density is

density =  \frac{40.8}{60}  \\

We have the final answer as

<h3>0.68 g/mL</h3>

Hope this helps you

8 0
3 years ago
Which atom has five electrons in its outer level and 10 electrons in the inner energy levels
Sever21 [200]

Oxygen 47 Hydrogen 63

Silicon 28 Oxygen 25.5

Aluminum 7.9 Carbon 9.5

Iron 4.5 Nitrogen 1.4

Calcium 3.5 Calcium 0.31

Sodium 2.5 Phosphorus 0.22

Potassium 2.5 Chlorine 0.03

Magnesium 2.2 Potassium 0.06

Titanium 0.46 Sulfur 0.05

Hydrogen 0.22 Sodium 0.03

Carbon 0.19 Magnesium 0.01

All others <0.1 All others <0.01 Living matter

6 0
3 years ago
What happens when you mix water and sugar​
alexandr1967 [171]

Answer:

Mixing water and sugar produces a mixture that is called a solution. In chemistry labs, this is often an experiment used to demonstrate the solubility of a solute in a solvent. In this experiment, the solute is sugar, and water is the solvent.

5 0
3 years ago
Consider the reaction 3X + 2Y → 5C + 4D With excess Y, how many moles of X are needed to produce 21.00 moles of D?​
Elan Coil [88]

Answer:

\huge\boxed{\sf 15.75\ moles }

Explanation:

<u>Given reaction is:</u>

3X + 2Y → 5C + 4D

<u>In this reaction, we have:</u>

For 3 moles of X, 4 moles of D

So,

4D = 3X

Divide both sides by 4

D = 3X/4

Multiply both sides by 21

21D = 3X/4 × 21

21D = 3*21X/4

21D = 63X/4

21D = 15.75X

So, to produce 21 moles of D, we need 15.75 moles of X.

\rule[225]{225}{2}

Hope this helped!

<h3>~AH1807</h3>
7 0
2 years ago
Read 2 more answers
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