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प्रश्न
Name two elements that have two electrons in their outermost shells.
उत्तर
(b) Magnesium (Mg) and calcium (Ca) have two electrons in their outermost shells.
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संबंधित प्रश्न
What are the main features of Mendeleev’s periodic table?
(a) Write its electronic configuration and determine its valency.
(b) Is it more reactive or less reactive than Ca (atomic number 20)? Justify your answer giving reason.
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(d) Write the formula of its oxide.
List two contrasting visible characters of garden pea Mendel used for his experiment.
Name an element whose properties were predicted on the basis of its position in Mendeleev's periodic table.
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In Mendeleev’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the Periodic Table later?
An element has 12 protons. The group and period to which this element belongs is ______
Eka-aluminium and Eka-silicon are known as ______
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