अमाउंट द फॉलोइंग एलिमेंट्स विच वन हस द हाईएस्ट वैल्यू फर्स्ट आयनाइजेशन पोटेंशियल ऑक्सीजन आर्गन बेरियम सीजीएम
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atomic numbers in a period are consecutive whereas in a group they increase in a pattern elements of the same group have similar valence shell electronic configuration and therefore exhibit similar chemical properties
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