ICSE Std-8 Chemistry - Variable Valency || Language of Chemistry || Cu with +1 & +2 Valency

Why element shows variable valencies? what are variable valencies? why cu has two different valencies?
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[LearnYourself]

Questions likely to asked from above video: (POST "👍" ( & que no.)IN A COMMENT IF YOU GET QUESTIONS IN EXAM FROM THESE)
1) What is penultimate shell?
2) write variable valency for copper.
3) Reason: Copper shows variable valency.
4) explain: how and why copper shows variable valency?

[dr.samtagorhe]

Thank u so much mam....Pls keep on making videos of ICSE lessons...Found very helpful....

[Rms]

How do we know which valency of phosphorus and Sulphur is to be used while making compound with other elements

[hitarahb]

Mam... thanks a lot... I was searching for copper and wondered how it has 1 and 2 valence electrons... now it's clear becoz of u. Excellent teaching

[riyageorge]

Thanks so much ma'am
Made it much easier to understand
Very helpful especially in this time of lockdown

[kavyasree]

Please post icse chemistry variable valence thank you madam my requests 😊

[laxywaxyy]

Thank you maam really helped me understand the topic well

[vaibhavs]

Thank u ma’am it was very helpful, I got full marks in that topic after seeing the video