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3 years ago

Which list of elements contains two metalloids?(1) Si, Ge, Po, Pb (3) Si, P, S, Cl(2) As, Bi, Br, Kr (4) Po, Sb, I, Xe

Chemistry

2 answers:

jeka943 years ago

5 0

The answer is (1). Si and Ge are both metalloids (semimetals)

Amanda [17]3 years ago

3 0

Answer is (1) - Si, Ge, Po, Pb

Metalloids are elements which share both non-metallic and metallic characteristics. Recognized metalloids are boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb) and tellurium (Te).

According to given choices 1st one has Si and Ge which are both metalloids.

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Explanation:

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the volume of a cylindrical tin can with a top and a bottom is to be 16Ï cubic inches. if a minimum amount of tin is to be used

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Answer:

The required height of the tin can is given by the height at the minimum value of the surface area function of the tin can

The height of the tin can must be 4 inches

Reason:

The given information on the tin can are;

Volume of the tin can = 16·π in.³

The amount of tin to be used = Minimum amount

The height of the can in inches required

Solution;

Let h, represent the height of the can, we have;

The surface area of the can, S.A. = 2·π·r² + 2·π·r·h

The volume of the can, V = π·r²·h

Where;

r = The radius of the tin can

h = The height of the tin can

Which gives;

16·π = π·r²·h

16 = r²·h

Which gives;

When the minimum amount of tin is used, we have;

Therefore;

4·π·(r³ - 8) = r² × 0

r³ = 8

r = 2

The radius of the tin can, r = 2 inches

The

The height of the tin can, h = 4 inches

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3 years ago

Orbitals are defined by which term?

emmasim [6.3K]

Answer: Option (d) is the correct answer.

Explanation:

An orbital is defined as the energy shell which can contain a maximum of two electrons with opposite spins.

A wave like behavior of an electron is determined by an orbital and basically an orbital acts like a mathematical function.

For example, in a p-sub shell the orbitals present are $p_{x}$ , $p_{y}$ and $p_{z}$ .

Therefore, we can conclude that orbitals are defined by energy level.

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4 years ago

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Phantasy [73]

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