Answer: Option (B) is the correct answer.
Explanation:
Elements of a group represent similar chemical properties because they contain same number of valence electrons which determines their reactivity.
Hence, elements of a group have same chemical nature or property.
A group is represented by a vertical column in a periodic table.
On the other hand, a period is represented by a horizontal line.
Thus, we can conclude that a column contains elements with similar properties in the periodic table.
Answer:
amoeba is the unicellular organism which can be seen by only microscope but not with our nacked eyes
Answer:
A
Explanation:
organs are made of tissue so it can't be D.
plant are made up of organs like roots, leaves, etc. so it can't be C.
skin (is an organ) is made up to 7 layers of ectodermal tissue so isn't B.
Answer:
a. 4, b. 6, c. 4, d. 2
Explanation:
The coordination number (CN) of a complex of a compound is the number of bonds that a metallic ion does with the binders, which can be equal or not.
a. The metallic ion is the iron (Fe), and it's bonded to 2 gly and 2 H2O, thus, CN = 4.
b. EDTA is a hexadentate molecule, thus, it forms 6 bonds with the metal Cr, and CN = 6.
c. The metal is Pt, which has 4 bonds with NH3, thus CN = 4.
d. The metal is Ag, which forms 2 bonds with NH3. NO3 is bonded with the structure and not with the metal. Thus, CN = 2.
