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Questions and Answers
Which element of group 1 is known for its reactivity with water?
Which element of group 1 is known for its reactivity with water?
- Rubidium
- Lithium
- Sodium
- Potassium (correct)
What is the atomic number of the element found in the 3rd period and group 2 of the periodic table?
What is the atomic number of the element found in the 3rd period and group 2 of the periodic table?
- 20 (correct)
- 12
- 3
- 4
Which subatomic particle is responsible for the identity of an element?
Which subatomic particle is responsible for the identity of an element?
- Neutron
- Electron
- Proton (correct)
- Isotope
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Study Notes
Periodic Table and Elements
- Alkali metals in Group 1 are known for their high reactivity with water, with the most reactive being Caesium.
- The element in the 3rd period and group 2 of the periodic table is Magnesium, which has an atomic number of 12.
- The atomic number of an element is determined by the number of protons in the nucleus, which is responsible for the identity of an element.
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