If element x has 20 protons, how many electrons does it have

1 answer:

7 0

Answer:

Explanation:

Number of protons = number of electrons

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poizon [28]

Answer: 42.14 g

Explanation: calcium nitrate - $Ca(NO_{3} )_{2}$

, the molar mass of calcium nitrate = 164 g

<h3> formula used = $given mass/molar mass$ = no of moles </h3>

mass required = $0.257*164$

= $42.14$ g

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1 year ago

worty [1.4K]

I think the number of protons in the nucleus the number of valence electrons atomic mass...

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3 years ago

german

JJ Thompson discovered electrons

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3 years ago

Dafna1 [17]

HNO3 + Ca —-> H2O + N20 + Ca(NO3)2

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allsm [11]

I'm pretty sure its graph 4

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3 years ago