There are 18 groups and 7 periods

There are 18 groups and 7 periods
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in the modern periodic table
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(a) What are ‘groups’ and ‘periods’ in the ‘periodic table’? (b) Two elements M and N belong to group I and II respectively and are in the same period of the periodic table. How do the following properties of M and N vary? Sizes of their atoms Their metallic characters Their valencies in forming oxides Molecular formulae of their chlorides -Science

Description : (a) What are groups' and periods' in the periodic table'? (b) Two elements M and N belong to group I and II respectively and are in the same period of the periodic ... Sizes of their atoms Their metallic characters Their valencies in forming oxides Molecular formulae of their chlorides -Science

Last Answer : (a) The vertical columns in the periodic table are called groups'. The horizontal rows in the periodic table are called periods'. (b) M' and N' belong to same period but group I ... oxides. Valency goes on increasing first and then decreases. MCI, NCI2 are molecular formulae of their chlorides.

How many periods and groups are there in the modern periodic table?

Description : How many periods and groups are there in the modern periodic table?

Last Answer : In the modern periodic table there are 7 periods and 18 groups.

What are periods and groups in the modern periodic table?

Description : What are periods and groups in the modern periodic table?

Last Answer : The horizontal rows in the periodic table are called periods. The vertical columns in the periodic table are called groups.

How are groups and periods classified in chemistry?

Description : How are groups and periods classified in chemistry?

Last Answer : answer:The periodic table rocks. While we do not do homework here I want to encourage you to explore it. Each element has a history and unique properties. This is just one of many awesome sites that can help you appreciate and understand the elements.

How many groups and periods are there in periodic table?

Description : How many groups and periods are there in periodic table?

Last Answer : 18 groups and 7 Periods

How many groups and periods are found in long form periodic table?

Description : How many groups and periods are found in long form periodic table?

Last Answer : Ans: 7 periods 18 groups

There are two groups, X and Y wrote an examination. The probability of X's pass is 3/5 and the probability of Y's pass is 5/7. What is the probability that only one of them is passed out? a) 15/16 b) 16/35 c) 12/43 d) 18/35

Description : There are two groups, X and Y wrote an examination. The probability of X's pass is 3/5 and the probability of Y's pass is 5/7. What is the probability that only one of them is passed out? a) 15/16 b) 16/35 c) 12/43 d) 18/35

Last Answer : Answer: B) Let X be the event of the group X pass Let Y be the event of the group Y pass Then, X'= Event of the group X's fail and Y'= event of the group Y's fail. Therefore, p(X) = 3/5 and p(Y) = 5/7, P(X') = 1 - P( ... )] + p[(Y And X')] = p(X) * p(Y') + P(Y) *P(X') = (6/35 + 10/35) = 16/35

The half`-` life periods of four isotopes are give below `:` `(i) 7.6 years` , ` ii. 4000 years` `iii. 6000 years`,`iv. 3.2xx10^(5) years` Which of th

Description : The half`-` life periods of four isotopes are give below `:` `(i) 7.6 years` , ` ii. 4000 years` `iii. 6000 years`,`iv. 3.2xx10^(5) years` Which of th

Last Answer : The half`-` life periods of four isotopes are give below `:` `(i) 7.6 years` , ` ii. 4000 years` `iii. ... is most stable ? A. iv B. iii C. ii D. i

Francis and George started a business with investments of Rs.7000 and Rs.10000. After x months, Francis left. After two more months David joined the business with an investment of Rs.10000. If the annual profit is shared among David, Francis and George in the ratio 10:7:24, find the respective time periods of David, Francis and George for which they stayed that year. a)5:5:12 b)1:1:3 c)1:1:4 d)1:1:2

Description : Francis and George started a business with investments of Rs.7000 and Rs.10000. After x months, Francis left. After two more months David joined the business with an investment of Rs.10000. If the annual profit is shared among David, ... which they stayed that year. a)5:5:12 b)1:1:3 c)1:1:4 d)1:1:2

Last Answer : a)5:5:12

There are 7 periods in each working day of a college. In how many ways can one organize 6 subjects such that each subject is allowed at least one period? A) 33200 B) 15120 C) 10800 D) 43600

Description : There are 7 periods in each working day of a college. In how many ways can one organize 6 subjects such that each subject is allowed at least one period? A) 33200 B) 15120 C) 10800 D) 43600

Last Answer : Answer: B)  6 subjects can be arranged in periods in 7P6 ways.  Remaining 1 period can be arranged in 6P1 ways.  Two subjects are alike in each of the arrangement. So we need to divide by 2! to avoid over counting. ... of arrangements = (7P6 x 6P1)/2!  = 5040 6 / 2 = 30240 / 2 = 15120

Element present in 1; 2 and 13-18 groups are known as;?

Description : Element present in 1; 2 and 13-18 groups are known as;?

Last Answer : Representative elements