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Stella [2.4K]
3 years ago
10

Use the portion of the periodic table shown below to answer the questions.

Chemistry
2 answers:
Basile [38]3 years ago
8 0
Part 1: Potassium, and Rubidium.
Part 2: Calcium has 20 protons and 20 electrons because the atomic number for calcium is 20 and that determines how many protons there are and in an atom, the number of protons is the same number of electrons. Calcium has about 20 neutrons. I got the number of Neutrons by subtracting the mass number(40.078) and the atomic number(20), I got 20.078. Round to the nearest whole number because you cannot have half or partial neutron. So, Calcium has 20 protons, 20 electrons, and 20 neutrons,

Hope this helps and please mark as brainliest!
lbvjy [14]3 years ago
4 0

<u>Answer:</u>

For 1: The two elements having same properties as sodium are potassium and rubidium.

For 2: Calcium has 20 protons, 20 electrons and 20 neutrons.

<u>Explanation:</u>

  • <u>For 1:</u>

The elements which belong to the same group, tend to have same properties. Group represents the vertical row in the periodic table. Hence, the elements which have same properties as sodium are potassium and rubidium.

  • <u>For 2:</u>

Atomic number is defined as the number of protons or electrons in an element.

Atomic number = Number of electrons = Number of protons

Atomic mass is defined as the sum of number of protons and neutrons in an element.

Atomic mass = Number of protons + Number of neutrons

Atomic number of calcium is 20. So, number of protons and electrons will be 20.

Atomic mass of calcium is 40.

40 = Number of neutrons + 20

Number of neutrons = 20

Hence, calcium has 20 protons, 20 electrons and 20 neutrons.

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List first thirty elements with their valences​
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Element   Atomic Number Valency

Valency of Hydrogen 1 1

Valency of Helium 2 0

Valency of Lithium 3 1

Valency of Beryllium 4 2

Valency of Boron 5 3

Valency of Carbon 6 4

Valency of Nitrogen 7 3

Valency of Oxygen 8 2

Valency of Fluorine 9 1

Valency of Neon 10 0

Valency of Sodium (Na) 11 1

Valency of Magnesium (Mg) 12 2

Valency of Aluminium 13 3

Valency of Silicon 14 4

Valency of Phosphorus 15 3

Valency of Sulphur 16 2

Valency of Chlorine 17 1

Valency of Argon 18 0

Valency of Potassium (K) 19 1

Valency of Calcium 20 2

Valency of Scandium 21 3

Valency of Titanium 22 4

Valency of Vanadium 23 5,4

Valency of Chromium 24 2

Valency of Manganese 25 7, 4, 2

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Valency of Cobalt 27 3, 2

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2 years ago
Which is the fastest in the universe apart from the light
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3 years ago
How many grams of ag can be formed from 5.50 grams of ag2o in the equation: 2ag2o (s) → 4ag (s) o2 (g)?
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From the given balanced equation we have find out the amount (in gm) of Ag formed from 5.50 gm of Ag₂O.

2Ag₂O(s) → 4Ag (s) + O₂ (g)

We know, molecular mass of Ag₂O= 231.7 g/mol, and atomic mass of Ag= 107.8 g/mol. Given, mass of Ag₂O=5.50 gm. Number moles of Ag₂O=\frac{5.50}{231.7}= 0.0237 moles.

From the balanced chemical reaction we get 2 (two) moles of Ag₂O produces 4 (four) moles of Ag. So, 0.0237 moles of Ag₂O produces \frac{4X0.0237}{2} moles=0.0474 moles of Ag= 0.0474 X 107.8 g of Ag=5.11g Ag.

Therefore, 5.50 g Ag₂O produces 5.11 g of Ag as per the given balanced chemical reaction.


4 0
3 years ago
1. Which on these elements has chemical properties most similar to
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Answer:

A

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