Question

Berilium, Electronic configuration and valence electrons​

Answer 1

Answer:

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बेरिलियम इलेक्ट्रॉनिक कॉन्फ़िगरेशन और वैलेंस इलेक्ट्रॉन

Lithium has a single electron in the second principal energy level and so we say that lithium has one valence electron. Beryllium has two valence electrons.

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What makes a particular element very reactive and another element non-reactive?

Element Name Beryllium

Symbol Be

Atomic Number 4

Electron Configuration 1s22s2

Answer 2

Answer:

[He] 2s²

Explanation:

electrons per shell =2/2