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2 years ago

What has 39 neutrons which element

Chemistry

1 answer:

Rasek [7]2 years ago

6 0

No of Neutrons =Mass No-No of protons

Proton=Neutron+1

$\\ \sf\longmapsto x+1=39$

$\\ \sf\longmapsto x=39-1=38$

Hence it has atomic no 38

The element is Stroncium(Sr)

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2 years ago

Which type of stoichiometry problems does not require the use of molar mass?

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2 years ago

if 11.74 liters of gas at STP are pumped into a basketball, how many moles of gas are in the basketball? assume the basketball w

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Answer:

0.52 mol

Explanation:

Using the general gas equation formula:

PV = nRT

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3 years ago

What is an electrolyte in an electrochemical cell?

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Explanation:

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3 years ago

Read 2 more answers

Write the isotopic symbol for the following (show your work) a) An isotope of iodine whose atoms have 78 neutrons b) An isotope

morpeh [17]

Answer:

For a: The isotopic representation of iodine is $_{53}^{131}\textrm{I}$

For b: The isotopic representation of cesium is $_{55}^{137}\textrm{Cs}$

For c: The isotopic representation of strontium is $_{38}^{52}\textrm{Sr}$

Explanation:

The isotopic representation of an atom is: $_Z^A\textrm{X}$

where,

Z = Atomic number of the atom

A = Mass number of the atom

X = Symbol of the atom

For a:

We are given:

Number of neutrons = 78

Atomic number of iodine = 53 = Number of protons

Mass number = 53 + 78 = 131

Thus, the isotopic representation of iodine is $_{53}^{131}\textrm{I}$

For b:

We are given:

Number of neutrons = 82

Atomic number of cesium = 55 = Number of protons

Mass number = 55 + 82 = 137

Thus, the isotopic representation of cesium is $_{55}^{137}\textrm{Cs}$

For c:

We are given:

Number of neutrons = 52

Atomic number of strontium = 38 = Number of protons

Mass number = 38 + 52 = 90

Thus, the isotopic representation of strontium is $_{38}^{52}\textrm{Sr}$

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3 years ago