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2 years ago

Two elements in the second transition series (Y through

Chemistry

2 answers:

ziro4ka [17]2 years ago

4 0

Answer:

Technetium and Rhodium

Explanation:

For Technetium, Symbol: Tc

Atomic number: 43

Electron configuration: [Kr] 4d55s2

Atomic mass: 98 u

For Rhodium, Symbol: Rh

Electron configuration: [Kr] 4d85s1

Atomic number: 45

Atomic mass: 102.9055 u

alukav5142 [94]2 years ago

4 0

Answer:

Technetium (Tc) and Rhodium (Rh)

Explanation:

The two elements in the second transition series ( Y through Cd) that have four unpaired electrons in their 3⁺ ions are

Tc [Kr] 4d⁵5s² after losing 3 electron becomes Tc [Kr] 4d⁴ and

Rh [Kr] 4d⁸ 5s¹ after losing 3 electron becomes Rh [Kr] 4d⁶ where Kr is the electronic configuration of Krypton ( a noble gas)

so both Technetium (Tc) and Rhodium (Rh) have four unpaired electrons

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A sample of silicon rejected for use in an electronic circuit has an impurity of boron at a level of 3 parts per trillion. What

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Answer:

A. 3 x 10-12

Explanation:

Generally, the parts-per notation is used to represent very small concentration without any specific unit.

Parts per million is notated as $10^{-6}$

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Hence, 3 parts per trillion will be written as 3 x $10^{-12}$

The correct option is A.

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In two or more complete sentences explain how to balance the chemical equation and classify its reaction type.

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C₅H₅ + Fe → Fe(C₅H₅)₂

Put a coefficient of 2 in front of C₅H₅ on the left side because there is a subscript of 2 after C₅H₅ in parenthesis on the right.

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This is a synthesis reaction because two reactants, C₅H₅ and Fe, are yielding a single product, Fe(C₅H₅)₂.

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A standard backpack is approximately 30cm x 30cm x 40cm. Suppose you find a hoard of pure gold while treasure hunting in the wil

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Explanation:

The dimensions of a standard backpack is 30cm x 30cm x 40cm

The mass of an average student is 70 kg

We know that, the density of gold is 19.3 g/cm³.

Let m be the mass of the backpack. So,

$\text{density}=\dfrac{\text{mass}}{\text{volume}}\\\\m=d\times V\\\\m=19.3\ g/cm^3\times (30\times 30\times 40)\ cm^3\\\\m=694800\ g\\\\\text{or}\\\\m=694.8\ kg\approx 700\ kg$

An average student has a mass of 70 kg. If we compare the mass of student and mass of backpack, we find that the backpack is 10 times of the mass of the student.

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