Questions :
1. Briefly describe the significance of Mendeleev's periodic table.
Because of two main reasons :
1- It grouped the elements together more accurately , according to their properties .
2- It made it possible to predict the properties of several elements that had not yet been discovered .
2. What is Moseley's contribution to the modern periodic table?
It grouped elements according to the increasing of atomic number .
3.Classify each of the following elements as a metal, a nonmetal, or a metalloid: As, Xe, Fe, Li, B, Cl, Ba, P, I, Si.
As : Metalloid
Xe : Nonmetal
Fe : Metal
Li : Metal
B : Metalloid
Cl : Nonmetal
Ba : Metal
P : Nonmetal
I : Nonmetal
Si : Metallloid
4. Compare the physical and chemical properties of metals and nonmetals.
Metals tend to be :
Because of two main reasons :
1- It grouped the elements together more accurately , according to their properties .
2- It made it possible to predict the properties of several elements that had not yet been discovered .
2. What is Moseley's contribution to the modern periodic table?
It grouped elements according to the increasing of atomic number .
3.Classify each of the following elements as a metal, a nonmetal, or a metalloid: As, Xe, Fe, Li, B, Cl, Ba, P, I, Si.
As : Metalloid
Xe : Nonmetal
Fe : Metal
Li : Metal
B : Metalloid
Cl : Nonmetal
Ba : Metal
P : Nonmetal
I : Nonmetal
Si : Metallloid
4. Compare the physical and chemical properties of metals and nonmetals.
Metals tend to be :
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