Advertisements
Advertisements
Question
Distinguish between:
Group 17 - Group 18
Advertisements
Solution
| Sr. No. | Group 17 | Group 18 |
| 1. | Elements of group 17 are called halogens. | Elements of group 18 are called inert gas elements or noble gases. |
| 2. | They have seven valence electrons. | They have eight valence electrons, except helium, which contains 2 electrons. |
| 3. | Their valency is 1. | Their valency is zero. |
| 4. | They form diatomic molecules with the general formula (X2). | They are monoatomic gases under normal conditions. |
APPEARS IN
RELATED QUESTIONS
Fill in the blank:
The modern periodic table consists of ……………. periods.
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium?
How does the tendency of elements to gain electrons change as we move from left to right in a period? State the reason of this change.
Write the merits of the modern periodic table over Mendeleev’s Periodic table
where should hydrogen be placed in the modern periodic table? Give reason for your answer.
Would you place the two isotopes of chlorine, CI-35 and CI-37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.
The three elements having chemical symbols of Si, B and Ge are:
(a) all metals
(b) all non-metals
(c) all metalloids
(d) Si is metalloid, B is metal and Ge is non-metal
How does the chemical reactivity of alkali metals vary on going in group 1 of the periodic table?
What is the number of elements is 1st period the modern periodic table?
Helium and neon are unreactive gases. What, if anything, do their atoms have in common?
An element X belongs to 3rd period and group 2 of the periodic table. State:
(a) number of valence electrons
(b) valency
(c) metal or non-metal
(d) name of the element
What are horizontal rows and vertical columns in a periodic table known as?
Name two elements in halogens.
Name the noble gas with 3 shells.
State the modern periodic law for the classification of elements. How many (i) groups and (ii) periods are there in the modern periodic table?
How many periods and groups are there in the modern periodic table?
How does number of (i) valence electrons (ii) valency; vary on moving from left to right in the second period of a periodic table?
Name an element of group 18 which can form compounds.
Answer the following question.
How it can be proved that the basic structure of the Modern Periodic Table is based on the electronic configuration of atoms of different elements?
Give the symbol and valency of the following element and radical.
Magnesium
Give the symbol and valency of the following element and radical.
Nitrate
Give the symbol and valency of the following element and radical.
Hydroxide
Give the symbol and valency of the following element and radical.
Carbonate
Fill in the blank:
The element lithium in the Modern Periodic Table with valency 1+ belongs to the group ______.
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
Find the correlation:
Group 13 to 18 : p block : : ______ : d block
Right or wrong sentence.
The modern periodic table shows the molecular masses of the elements in each frame.
Distinguish between:
s-block - p-block
Identify gas A in the following experiment.
The arrangement of elements in the Modern Periodic Table is based on their ______.
The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group?
Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern Periodic Table. Also, give their valencies.
If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride?
A part of modern periodic table is given below. On its basis, answer the following questions:
| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
Write the molecular formula of the compound formed by the combination:
A and F
- Write the electronic configuration of element X, given by its symbol as under: \[\ce{^40_20 X}\]
- Determine its position in the modem periodic table.
- What is the nature of its oxide?
- Name one other element of its group.
Give the criteria on the basis of which elements are placed (i) in a group and (ii) in a period in the modern periodic table. The atomic number of an element is 16. According to the criteria, in which group and period it should be placed?
An element belonging to 3d series of modern periodic table has spin magnetic moment = 5.92 B.M. in +3 oxidation state. The atomic number of elements are ______.
Define groups of modern periodic table.
Name two elements that you would expect to show chemical reactions similar to calcium. What is the basis of your choice?
