The atomic number of an element is 20. In which period of modern periodic table, could this element be placed? Why? How will you decide whether the element is a metal or non metal?
Answers
Answer:
it should be placed on the 4th period
Explanation:
Metallic character of an element increases down the period and decreases along the group so the element is a metal
Calcium (ca) is the element with atomic number 20. This can be found in period four of modern periodic table. This is placed in the fourth period because it is done by seeing the electronic configuration. Calcium has 20 electrons. So the electronic configuration will be 2,8,8,2. Which makes it places at the fourth period. Metals are conductor of heat, malleable, shiny and ductile. So Calcium is a metal.
Following are more points in detail:• Calcium is the element with atomic number 20.• Calcium is an alkaline metal. It vanishes in air.• It is placed in the fourth period in the modern periodic table .It has atomic number 20, so it's electronic configuration is 2,8,8,2. Calcium is a metal. Following properties makes it a metal:1. Ductile- Calcium can be drawn in wires
2. Good conductor of heat- It conducts heat.
3. Lustrous- It is shiny, Calcium is silver-white.
4. When it looses two electrons, it makes Ca2+(ions)
5. Calcium conducts electricity
6. Reacts with water.
7. Malleable metal.
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