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Second group elements
Li and Na
Be, Mg, Ca and Sr all have same chemical property as they are in the same group.
All the answers are correct.
Inert Gases
Atomic Number decides the chemical properties of elements.
Halogens
Noble gases are not fit into metal or non-metal group.
Mendeléev’s Periodic Table contains: vertical columns called ‘groups’ horizontal rows called ‘periods’
Sc and Ge
Name two elements that have two electrons in their outermost shells.
Second group elements
Second group elements
See lessName three elements that have a single electron in their outermost shells.
Li and Na
Li and Na
See lessName two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
Be, Mg, Ca and Sr all have same chemical property as they are in the same group.
Be, Mg, Ca and Sr all have same chemical property as they are in the same group.
See lessHow could the Modern Periodic Table remove various anomalies of Mendeléev’s Periodic Table?
All the answers are correct.
All the answers are correct.
See lessFill in the blanks: Group 18 elements are called ______________
Inert Gases
Inert Gases
See lessFill in the blanks: The basis of modern Periodic table is _______________
Atomic Number decides the chemical properties of elements.
Atomic Number decides the chemical properties of elements.
See lessFill in the blanks: Group 17 elements are called ______________
Halogens
Halogens
See lessWhy do you think the noble gases are placed in a separate group?
Noble gases are not fit into metal or non-metal group.
Noble gases are not fit into metal or non-metal group.
See lessWhat were the criteria used by Mendeleev in creating his Periodic Table?
Mendeléev’s Periodic Table contains: vertical columns called ‘groups’ horizontal rows called ‘periods’
Mendeléev’s Periodic Table contains:
See lessvertical columns called ‘groups’
horizontal rows called ‘periods’
Besides gallium, which other elements have since been discovered that were left by Mendeleev in his Periodic Table? (any two)
Sc and Ge
Sc and Ge
See less