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RRB RPF एवं RPSF SI परीक्षा 19 Dec 2018 Shift 3
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Question : 31
Total: 120
एल्युमीनियम तत्व का परमाणु क्रमांक कितना है ?
15
17
13
19
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Solution:
(3) एल्युमिनियम एक रासायनिक तत्व है जिसका प्रतीक
Al
और परमाणु संख्या 13 है। परमाणु संख्या परमाणु के नाभिक में स्थित प्रोटॉन की संख्या है, जो रासायनिक तत्व की एक विशेषता है और आवर्त सारणी में इसकी जगह निर्धारित करती है।
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