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तीन तत्वों X,Y, Z की परमाणु संख्या क्रमशः 5,7 और 10 है। इनमे से अठारवें, पंद्रहवे और तेहरवें वर्ग से सम्बंधित क्रमशः कौन-कौन-सा तत्व है? ये तत्व किस आवर्त से सम्बंधित है?

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Z तत्व, Y तत्व, X तत्व क्रमशः तेहरवें, पंद्रहवे, अठारवें वर्ग से सम्बंधित है। ये तत्व दूसरे आवर्त से सम्बंधित है।

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