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An alkali element in Period 2, its atomic number is equal to:
3 (Lithium)
If the last energy level of a halogen element is L, its atomic number is
9
An element in Period 3 and Group 3A, with 14 neutrons in its nucleus, its mass number is:
27 (Aluminum)
The valency of argon is:
zero
Elements in the same period have similar chemical properties (true or false)
False
The atomic radius in a group increases with increasing atomic number (true or false)
true
The atomic number of the noble gas in Period 2 is
10 (Neon)
