Chemistry, 09.11.2020 09:20 rachel693

The seasons of the Earth are the result of -- a
the tilt of the Earth and its orbit around the Sun.
b
the Sun having a large gravitational pull.
c
the orbit of the moon around the Earth.
d
the continual rotation of the Earth on its tilted axis.

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Answer from: rolo7105

the tilt of the Earth and its orbit around the Sun.

Explanation:

The seasons on the earth is as a result of the tilt of the earth and its orbit around the sun.

These phenomenon causes the four seasons of the earth. The earth is tilted at an angle of 23.5° from the perpendicular.

This causes the differences in yearly exposure of parts of the earth to solar radiation.

At some points, a part can experience very high insolation whereas it is low in other parts.

These variations results in the seasons on the earth.

Answer from: Quest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

Answer from: Quest

It shows that the experiment is designed properly.

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The seasons of the Earth are the result of -- a
the tilt of the Earth and its orbit around th...