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सबसे पहले जर्मन रसायनज्ञ जोन डाॅवेराइनर ने इस बात कि आेर सकेत किया कि तत्वो के गुणधर्मो मे निश्चित प्रवृति होती है| इन्होने यह किस सन् मे कहा?
Asked Sep 26, 2023
Modified Sep 26, 2023
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asked Sep 26, 2023 at 18:40
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1800 के प्रारम्भिक दशको मे
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answered Sep 26, 2023 at 18:40
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