Clouds are an example of which colloidal solution.​

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Answer:

1.alkali metals are never found in nature uncombined because they are unstable and they react fast to other elements easily by losing the electron. They bond well with all elements except the noble gases. When these elements are in the air, they quickly turn black.

Therefore, we can conclude that alkali metals are highly reactive chemically and do not exist in a free or native state and are not easily found in nature.

2. Diagonal relationship between Lithium and Magnesium

Lithium shows a diagonal relationship with Magnesium.

Due to its small size lithium differs from other alkali metals but resembles magnesium, as its size is closer to lithium. The diagonal relationship is formed due to the identical size of ions.

As we move downward across a group in the periodic table then the size of the atoms gradually increases.

As we move towards right across a period in the periodic table, then the size of the atom reduces.

A diagonal relationship is said to exist between certain pairs of diagonally adjacent elements in the second and third periods (first 20 elements) of the periodic table.

Explanation:

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An arch is a vertical curved structure that spans an elevated space and may or many not support the Wight above it.[1] or in case of a horizontal arch like an arch dam, the hydrostatic pressure against it

Explanation:

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Answer:

Louisa: Louisa is Charley's wife. She is loving and caring towards her husband. However, she is a simple lady and it is not difficult to take her in.

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