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raketka [301]
2 years ago
5

Why are there 8 elements in the 3rd stage in a periodic table ?​

Chemistry
2 answers:
Olin [163]2 years ago
5 0

Answer:

stu pid

Explanation:

olga2289 [7]2 years ago
3 0

Answer:

PLEASE MARK ME AS THE BRAINLIEST

Explanation:

According to the 2n2 rule, the maximum number of electrons in the third period = 2 x (3)2 = 18. But, the last shell cannot accommodate more than 8 electrons so, the number of electrons in third period is 8. Hence, the number of elements is also 8.

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What is the systematic name of Mg(NO3)2?
goldenfox [79]
Mg(NO3)2 => <span>Magnesium nitrate

hope this helps!</span>
5 0
3 years ago
How many moles of water are produced when 2 moles of NaHCO3 react with 2 moles of HCI?
Tju [1.3M]

Answer:

H₂O = 3.56 moles

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Explanation:

7 0
3 years ago
How much energy is lost to condense 300. grams of steam at 100.C?
True [87]

Energy lost to condense = 803.4 kJ

<h3>Further explanation</h3>

Condensation of steam through 2 stages:

1. phase change(steam to water)

2. cool down(100 to 0 C)

1. phase change(condensation)

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\tt Q=300\times 2260=678000~J

2. cool down

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\tt Q=300\times 4.18\times (100-0)=125400

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3 0
2 years ago
What is the frequency of the sinusoidal graph?
Arisa [49]

Answer:

For finding frequency, we need to first find the period of the graph.

The period of a sinusoidal graph is the time interval in which it repeats its pattern.

In the graph, we can see, after 1/period time, it repeats its pattern.

Hence the period of the graph is  \pi /2.

Now we need to find its frequency 1/\pi /2

The formula for frequency is 2/\pi

This is the answer

i hope you pass the assignment

try your best!

8 0
2 years ago
When cells or organisms maintain a stable internal state in a changing environment is called?
Goryan [66]

Answer:

Homeostasis

Explanation:

8 0
3 years ago
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