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lbvjy [14]
3 years ago
8

What is the total number of neutrons in the nucleus of a neutral atom that has 19 electrons and a mass of 39?

Chemistry
1 answer:
JulsSmile [24]3 years ago
3 0
20 because
mass no=electrons+neutrons
so to find neutrons
mass no-electrons=neutron
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PLEASE ANSWER AS QUICKLY AS POSSIBLE THANK YOU SO MUCH
Harlamova29_29 [7]

Answer:

This description needs a unit describing the system of measurement.

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1 year ago
C10H12O4S(s) + O2(g)  CO2(g) + SO2(g) + H2O(g)
ale4655 [162]

Answer: The coefficient for O_2(g) is 12.

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

C_{10}H_{12}O_4S(s)+12O_2(g)\rightarrow 10CO_2(g)+SO_2(g)+6H_2O

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2 years ago
In Part A, you found the amount of product (1.80 mol P2O5 ) formed from the given amount of phosphorus and excess oxygen. In Par
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Second, we calculate the amounts we start with

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O2: 112 g = 112 g / 32 g/mol = 3.5 mol

Lastly, we calculate the amount of P2O5 produced.

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3 0
3 years ago
The table above shows the number of protons in an Adam of four different elements according to the periodic table which of these
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Answer:

<u>The correct answer is X</u>

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Explanation:

First have some idea about : Valency , Metals and non- metals.

Valency : It is the combining capacity of elements . The elements combine to other elements to gain stability . They always try to complete their octet(8 electrons in the outermost shell)

For Example : Na has 11 electron

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First shell contain maximum = 2 electron

2nd shell = maximum 8 electron

3 shell = maximum 18 electron

When it remove 1 electron from outermost shell , it is left with 2 ,8 configuration. Now , its outer most shell has 8 electron . so it get stable and show +1 valency.

When the element looses electron , it get positive charge

When the element gain electron it get negative charge

Metals: those element which show +1 , +2 , +3 valency are considered as metals

Non- metals = Those metals which show the valency of -1 , -2 ,-3 are considered as Non- Metals.

Questions:

1. T = 7 proton

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It gains (-ve charge) 3 electron to achieve complete octet(5+3 = 8) = -3 valency

It is non- metal

2. Q=15

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It is non- metal

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Its electronic configuration = 2 ,8 , 2

It loses (+ve charge) 2 electron to achieve complete octet( 2 , 8) = + 2 valency

It is  metal

4.Z = 17

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4 0
3 years ago
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8 0
3 years ago
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