Cs।
প্রথম আয়নীকরণ শক্তি হল একটি পরমাণুর এক মোল থেকে একটি ইলেকট্রন অপসারণের জন্য প্রয়োজনীয় শক্তি। আয়নীকরণ শক্তি সাধারণত পর্যায় সারণির বাম থেকে ডানে এবং উপর থেকে নিচে হ্রাস পায়। এর কারণ হল পারমাণবিক ব্যাসার্ধ বৃদ্ধি পাওয়ার সাথে সাথে ইলেকট্রনগুলি নিউক্লিয়াসের কাছাকাছি আসে এবং নিউক্লিয়াসের আকর্ষণ কমে যায়।
Cs হল পর্যায় সারণির গ্রুপ 1 এর সদস্য, যাকে ক্ষার ধাতু বলা হয়। ক্ষার ধাতুর পারমাণবিক ব্যাসার্ধ বৃহৎ এবং একক ভ্যালেন্স ইলেকট্রন থাকে। এই বৈশিষ্ট্যগুলি Cs-এর জন্য প্রথম আয়নীকরণ শক্তিকে কম করে তোলে।
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