PUMPA - SMART LEARNING
எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்
Book Free Demo1.Besides gallium, which other elements have since been discovered that were left by Mendeleev in his periodic table ? (any two)
2. In the modern periodic table, which are the metals among the first ten elements ?
Answer variants:
It failed to arrange all the then-unknown elements in triads of elements with similar chemical properties.
hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine and neon
Scandium and Germanium.
Noble gases are physically inert and are present in the atmosphere in extremely low concentrations.
Register for free to see more content