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Crazy boy [7]
3 years ago
5

Which of the following groups of elements are likely to be radioactive? (5 points) a Actinides b Noble gases c Transition metals

d BCNOs
Chemistry
1 answer:
Nataly [62]3 years ago
3 0

Answer:

Actinides

Explanation:

They are defined as "any of the series of fifteen metallic elements from actinium (atomic number 89) to lawrencium (atomic number 103) in the periodic table. They are all radioactive, the heavier members being extremely unstable and not of natural occurrence"

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Why we use cotton cloth to mop the floor?
ch4aika [34]

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because cotton have a good absorbing quality and can absorb water more which is used to mop the floor

Explanation:

4 0
2 years ago
What is the balanced equation of <br> H2 + Cl2 —-&gt; HCl
VMariaS [17]

Answer:

The balanced equation of H2 + Cl2 —-> HCl is 2H2 + 2Cl2 —-> 2HCl.

Explanation:

In a chemical reaction, the number of atoms of each element must be the same on both sides of the equation. In this case, there are two atoms of hydrogen on the left side and two atoms of chlorine. On the right side, there is one atom of hydrogen and one atom of chlorine. In order to balance the equation, we must add another chlorine atom to the right side so that there are two atoms of chlorine on both sides of the equation. The final balanced equation is 2H2 + 2Cl2 —-> 2HCl.

8 0
2 years ago
How many atoms are in 8.00 moles of potassium chromate?​
8_murik_8 [283]

Answer:

481.6x10^23

Explanation:

3 0
3 years ago
Read 2 more answers
Which of the following scientists did not contribute to the cell theory? A. Virchow B. Hooke. C. Schleiden D. Newton
e-lub [12.9K]
The answer is... Newton
8 0
4 years ago
According to the website of the National Aeronautics and Space Administration (NASA), the average temperature of the universe is
charle [14.2K]

Answer : The temperature in degree Celsius is, -270.45^oC

Explanation :

The conversion used for the temperature from Kelvin to degree Celsius is:

^oC=K-273.15

where,

K = temperature in Kelvin

^oC = temperature in centigrade

As we are given the temperature in Kelvin is, 2.7

Now we have to determine the temperature in Kelvin.

^oC=K-273.15

^oC=2.7-273.15

^oC=-270.45

Therefore, the temperature in degree Celsius is, -270.45^oC

3 0
3 years ago
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