How Fast Do Different Parts Of The EM Spectrum Travel In A Vacuum?

Answers

Answer 1

Answer: All electromagnetic waves travel at light speed, so they all travel the same speed.

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How many experimental trials are needed before a hypothesis can be accepted as true ?

Answers

approximately, or at least the test must be repeated until 3 times, to find an accurate average and hypothesis.

3 times or more because you need to have 3 trails or more to be able to explain why your hypothesis is correct!!

How many electrons can be held in the second orbital (closest to the nucleus)

Answers

The number of electrons that can be held in the second orbital (closest to the nucleus) is 8 electrons

How to determine the number of electrons in the 2nd orbital?

The arrangementof electrons in various energy levels or orbital follows a well defined order. This can be determined by using the following formula:

Number of electrons = 2n²

Where

n is the number of orbital/shell

Now, we shall obtain the number of electrons in the second orbital. Details below:

Number of shell = 2
Number of electrons =?

Number of electrons = 2n²

= 2 × 2²

= 2 × 4

= 8 electrons

Thus, the number of electrons in the second orbital is 8 electrons

Learn more about number electrons in energy levels:

brainly.com/question/28066225

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the orbital is called an energy level and they follow an 2/8/8 rule.
2 in the first
8 in the second
and
8 in the third.
so 8 would be the answer.

Which elements have isotopes with the same number of protons and neutrons

Answers

Answer:

Lead

Explanation:

One that I know is lead.

Final answer:

Isotopes refer to different forms of the same element having identical number of protons but varying number of neutrons. Examples of isotopes with equal number of protons and neutrons include Carbon-12 and Deuterium. These isotopes, including the unstable ones termed as 'radioactive isotopes', contribute significantly to an element's atomic mass.

Explanation:

Isotopes are alternate forms of the same element that have the same number of protons but a different number of neutrons. When an isotope has the same number of protons and neutrons, it can be found in lighter elements such as carbon and hydrogen. A good example is the isotope Carbon-12 (with six protons and six neutrons) which is a common isotope of carbon found on Earth. Another example is Hydrogen-2 or Deuterium (with one proton and one neutron). This is because the number of protons (also known as the atomic number) identifies an element - regardless of the number of neutrons.

The presence of isotopes is important in elements as they contribute to the overall atomic mass and affect the behavior of the element. For instance, radioactive isotopes, such as Carbon-14, are unstable and can emit subatomic particles or energy to attain a lower potential energy state, which explains why they're used in radioactive dating methods.

It's worth noting that the number of neutrons in an atom can vary and is not necessarily equal to the number of protons, especially in heavier elements.