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Atomic Mass

What is the m...

Question

What is the mass number of the nucleus $_{84}^{128} A$ ?

211

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128

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213

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214

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Solution

The correct option is D $128$
Generally a nucleus is represented as $_{Z}^{A} X$ where $A =$ mass number and $Z =$ proton number.
Here, $A = 128, Z = 84$
Thus, mass number is $128$ .

Suggest Corrections

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A

86

128

A

The following table gives some of the powers of 2.

Can you compute the products using the table.

(i) 16 × 64

(ii) 32 × 512

(iii) 64 × 256

(iv) 128 × 256

[\begin{matrix} 3 & - 2 \\ 1 & 4 \end{matrix}] + [\begin{matrix} - 2 & 4 \\ 1 & 3 \end{matrix}]

[\begin{matrix} 2 & 1 & 3 \\ 0 & 3 & 5 \\ - 1 & 2 & 5 \end{matrix}] + [\begin{matrix} 1 & - 2 & 3 \\ 2 & 6 & 1 \\ 0 & - 3 & 1 \end{matrix}]

\frac{8}{2^{2} + 1} + \frac{16}{2^{6} + 1} + \frac{32}{2^{14} + 1} + \frac{64}{2^{14} + 1} + \frac{128}{2^{18} + 1} =

16

3 \times 10^{- 15} m

128

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