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3 years ago

Please help question is attached

Chemistry

1 answer:

Likurg_2 [28]3 years ago

4 0

Top R is physical. Top L is chem. Bottom L is physical. Bottom R is chem.

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Which of the following places the elements in the correct order of increasing first ionization energy?

Papessa [141]

A) Ca, Mg, Be
The first ionization energy increases as we move up a group because of the smaller atomic size and less shielding of electrons.

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3 years ago

Read 2 more answers

How many unpaired electrons are present in the ground state of an atom from each of the following groups?

Paha777 [63]

Explanation:

General electronic configuration for the given groups are as follows.

For 4A(14) : $ns^{2}np^{4}$

This means that there are 4 unpaired electrons in group 4A(14).

For 7A(17) : $ns^{2}np^{5}$

So, there are 7 unpaired electrons present in group 7A(17).

For 1A(1) : $ns^{1}$

Hence, there is only one unpaired electron present in group 1A(1).

For 6A(16) : $ns^{2}np^{4}$

So, there are 6 unpaired electrons present in group 6A(16).

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4 years ago

The table above lists the wavelength range, frequency range, possible uses, and hazards of the seven types of electromagnetic ra

marusya05 [52]

Answer: A. Gamma Ray

Explanation:

X-ray scans can diagnose possibly life-threatening conditions such as blocked blood vessels, bone cancer, and infections. However, x-rays produce ionizing radiation—a form of radiation that has the potential to harm living tissue. However, the risk of developing cancer from radiation exposure is generally small.

Please mark brainliest if it helped :)

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3 years ago

Which statements describe dark matter? Check all that apply. It is invisible. It is the same as dark energy. It is well understo

Alla [95]

Dark matter is invisible and does not emit electromagnetic radiation. Dark matter is part of a theory that hypothesis the existence of a counterpart to the particles we know in physics, in order to balance the universe that otherwise would be largely unbalanced right now. However, the theory right now is not yet proven.

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3 years ago

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If light at 193 nm from an argon–fluoride laser is incident on a gold metal surface, electrons with kinetic energy of 1.80  10–

MAVERICK [17]

Answer:work function= 8.2×10-19J

Minimum wavelength of light required= 2.4×10-7m

Explanation:

The wavelength of incident light was given as 193nm. We have to convert this to meters and have 193×10-9m. Then we use it to find the energy of incident photon E. When E is found we now apply Einstein photoelectric equation to obtain the work function Wo since the kinetic energy of photoelectrons is known as 1.8×10-19J.

From this work function. We can obtain the minimum wavelength of light required. All these steps are shown in the image attached.

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3 years ago