Groups and Periods (Mendeleev's)

Q.

From top to bottom in any group of the periodic table the electropositive character of the element___.

1. Increases

2. Decreases

3. Remains unchanged

4. Changes irregularly

Q. The shortest period in the modern periodic table contains only two elements i.e, hydrogen and .

1. helium
2. neon
3. lithium
4. berylium

Q.

Name the elements of the shortest period in the modern periodic table.

Q.

Mention the Mass number, Atomic number and valency of carbon.

Q.

Write an introduction to the modern periodic table.

Q.

Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-Silicon and Eka-Aluminium.
What is the group and the period of these elements in the Modern Periodic Table.

1. Eka-Silicon (Germanium) - Group 14; Period 4
   Eka-Aluminium (Gallium) - Group 13; Period 4

2. Eka-Silicon (Germanium) - Group 15; Period 4

   Eka-Aluminium (Gallium) - Group 16; Period 4

3. Eka-Silicon (Germanium) - Group 17; Period 4
   Eka-Aluminium (Gallium) - Group 18; Period 4

4. Eka-Silicon (Germanium) - Group 13; Period 4

   Eka-Aluminium (Gallium) - Group 14; Period 4

Q.

Who Named Oxygen?

Q.

Can atoms have valencies more than 4..how ..please explain with examples

Q.

State modern periodic law. What is the number of groups and periods in the modern periodic?

Q.

In both 1st and VII group of the periodic table following property increases with increase in atomic number.

1. Highest valency state

2. Reactivity with water.

3. Oxidising property

4. Atomic size

Q. Which group of element was missing fromMendeleevs original periodic table?

Q.

All the elements in a period of a modern periodic table have the same ______

1. Valence shell

2. Valence electrons

3. Atomic number

4. Mass number

Q. Why is it logical to end a period in the modern periodic table?

Q. The number of periods and groups in Mendeleev 's periodic table.
My text book says 9 groups and 7 periods and there is something else on internet?

Q.

Mention the Mass number, Atomic number and valency of carbon.

Q. The element with the smallest size in group 13 is ___.

Q.

Smita studied about the Modern Periodic Table. She placed hydrogen, lithium, sodium, and calcium in the same group in the periodic table. However, her teacher told her that she has placed one element incorrectly in the periodic table.(Atomic numbers of $\mathrm{H}$, $\mathrm{Li}$, $\mathrm{Na}$, and $\mathrm{Ca}$ are 1, 3, 11, and 20 respectively) Which element has been placed incorrectly by Smita?

Q.

The element with the smallest size in group 13 is ___.

Q. According to Mendeleev’s periodic table, the vertical columns and horizontal rows are respectively called as:

1. Groups and Rows
2. Rows and Periods
3. Groups and Periods
4. Periods and Groups

Q. How many shells in calcium atom are filled with electrons?

1. Three
2. Five
3. Four
4. Two

Q.

Are He, Ne, Ar, Kr, Xe and Rn the only known noble gases?

Q. According to Mendeleev’s periodic table, the vertical columns and horizontal rows are respectively called as:

1. Rows and Periods
2. Groups and Rows
3. Groups and Periods
4. Periods and Groups