Given the following, how many protons are in an atom of chlorine? What is the atomic number of sodium?

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Given the following, how many protons are in an atom of chlorine? What is the atomic number of sodium?

An atom of chlorine (Cl) has 6 more protons than an atom of sodium (Na). The atomic number of chlorine is 5 less than twice the atomic number of sodium. The atomic number of an element is equal to the number of protons per atom.

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Answer 1 · 2017-05-14T08:50:28

For $C l$ $Cl$ , $Z = 17$ $Z=17$ .

Explanation:

$Z = the atomic number$ $Z="the atomic number"$ , the number of massive, positively charged nuclear particles. $Z$ $Z$ defines the identity of the element. For $C l$ $Cl$ , $Z = 17$ $Z=17$ .

We are given that $Z_{Na} + 6 = Z_{Cl}$ $Z_"Na"+6=Z_"Cl"$ , and thus $Z_{Na} = 11$ $Z_"Na"=11$ .

And $2 \times Z_{Na} - 5 = 22 - 5 = 17 = Z_{Cl}$ $2xxZ_"Na"-5=22-5=17=Z_"Cl"$ as required.

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Given the following, how many protons are in an atom of chlorine? What is the atomic number of sodium?

An atom of chlorine (Cl) has 6 more protons than an atom of sodium (Na). The atomic number of chlorine is 5 less than twice the atomic number of sodium. The atomic number of an element is equal to the number of protons per atom.

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