ব্রিটিশ পদার্থবিদ রাদারফোর্ড এর সিদ্ধান্ত :
১, পরমানুর অভ্যন্তরে যথেষ্ট পরিমাণ ফাঁকা স্থান আছে। তাই অধিকাংশ আলফা কণা ধাতব পাত ভেদ করে সোজা চলে যায়। ইলেক্ট্রনের তুলনায় আলফা কণা ভারী বলে ইলেক্ট্রনের প্রভাবে আলফা কণা মোটেই প্রভাবিত হয় না। বরং সোজা চলে যায়।
২, মাত্র কিছু সংখ্যক আলফা কণা ৯০ ডিগ্রী বা তার বেশি কোনে বিক্ষেপিত হয়ে ফিরে আসে।
৩, এতে তিনি সিদ্ধান্ত নেন যে, পরমানুর অভ্যন্তরে সকল ধ্বনাত্মক কণিকা তথা সমস্ত ভর পরমানুর ভিতর অতিক্ষুদ্র পরিসরে পঞ্জিভূত থাকে। একে পরমানুর নিউক্লিয়াস বলে।
৪, ফিরে আসা আলফা কণিকার সংখ্যা অত্যন্ত কম বলে প্রমাণিত হয় যে, ধনাত্মক নিউক্লিয়াসের আয়তন পরমানুর সমগ্র আয়তনের তুলনায় অতি নগন্য।
1 x Booting (67.63%) | 84.50ms |
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