Question

ery active on
riodic table
2
c table
Which one is more reactive out of Fluorine and Chlorine? Why?
A small portion of Modern periodic table (Group 1) is given. Givet
hydrogen along with metals in this
group.
3. Elements of
group 1, 2, 13 are more reactive as we go down in the
table, why?
Modern periodic table is less defective than Mendeleev's periodic
to justify it.
Group-C
eley's per
Mention any three characteristics of Mendeleev's periodic table.
Write down the three drawbacks of Mendeleev's periodic table.
Write down three characteristics of Modern periodic table.
Which group of the periodic table does the element ‘A’ belong to
reactive in between 'B' and 'C'? Give reason.
Element
Electronic configuration
А
2,8,5
B
2,3
C С
2,8,3
Identify the groups of the alkali metals, metalloids and inert g
8
What is the valency of chlorine and neon? Why?
2
13
14
15
16
17​

Answer 1

Fluorine is more reactive than Chlorine because it has a higher electro negativity and chlorine has more electrons which causes it to repel reacting electrons with greater force.

Elements are more reactive as you go down the periodic table because ionization energy decreases down a group which means they can lose electrons more easily, making them more reactive.

The modern periodic table is arranged by atomic number rather than atomic mass, and many discoveries of new elements have been made that make a more complete table.

The vertical columns and horizontal rows in Mendeleev’s table are called groups and periods respectively. There are seven periods and eight groups. Elements with the same properties are in the same group and all elements were ordered by atomic mass.

Three drawbacks of Mendeleev’s table are: it’s arranged by atomic mass rather than atomic number. Isotopes violate Mendeleev’s periodic law. Mendeleev could not figure out where to place hydrogen.

Modern periodic table is arranged by atomic number, it has 7 periods and 18 groups, and is divided into 4 blocks (s-, p-, d-, and f-)