Question

In a class test containing 10 questions, 5 marks are awarded for every correct answer and (-2) marks are awarded for every incorrect answer and 0 for questions not attempted. Logith gets six correct answers and two incorrect answers out of eight questions he attempts. What is his score?​

Answer 1

Step-by-step explanation:

Valency of element X is 2

Element X is "Metal"

Explanation:

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It is given that ,

Element X whose atomic number = 20

Mass number = 40

we have to calculate the valency and decide whether it is metal or non metal.

Firstly we find the name of element X

As per given condition the mass of element X is 20 and its mass is 40

So, the elements will be Calcium .

Electronic Configuration of Calcium

Ca = 2,8,8,2

Now, we know that valency of an element is calculated " The number of electrons present in last orbit of an element "

Here, in last orbit of calcium 2 electrons are present .

So, valency of element X is 2

Since ,2 electrons present in its last orbit so it like to loose 2 electrons from its orbit to gain it stability/noble gas configuration .

And , the elements which loose electrons to gain stability are generally Metal .

Hence, the element X is a "Metal. Mark me as brain list

Answer 2

Answer:

correct answer =5marks

incorrect answer= -2marks

logith correct answer marks =5*6=30 marks

logith incorrect answer marks = -2*2=-4

total marks =30+(-4)=26 marks