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Question : 88 of 150
Marks:
+1,
-0
Solution:
- As we move from left to right in a periodic table the element atomic number increase.
- Beryllium (Be) with an atomic number ‘4’ comes before Boron (B) that has an atomic number of 5.
- Sodium (Na) with an atomic number ‘11’ comes after Neon (Ne) that has atomic number of 10.
- Helium (He) with an atomic number ‘2’ comes after Hydrogen (H) that has an atomic number of 1.
- Calcium (Ca) with an atomic number ‘20’ comes after Chlorine (Cl) that has an atomic number of 17.
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