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Name: . Total Marks : 20

Duration : 40 Mins.

Section A

1.Which oneof the following statements is truefor all elements?

Neutral atoms of the same element contain

A equal numbers of protons and neutrons.

B equal numbers of protons and electrons.

C equal numbers of neutrons and electrons.

D equal numbers of protons, neutrons andelectrons.

2. Which one of the following statements about the isotopes of a particular element is wrong?

All the isotopes of a particular element have neutral atoms having

A the same atomic number.

B the same number of protons.

C the same number of neutrons.

D the same number of electrons.

3. Which oneof the following elements has the electronic structure in this diagram?

A berllium

B fluorine

C neon

D chlorine

4. Which oneof the following electronic structures represents sulfur?

A !,",#

B !,",",",#

C !,",$",%

D !,#,"

5. Which oneof the following electronic structures does notrepresent a noble gas?

A !,"

B !

C !,",$","

D !,",",!

6. Which oneof the statements about an atom with an atomic number of $&, and a mass number of '( is

wrong?

A )he atom is an isotope of chlorine.

B )he electronic structure is !,",&.

C )he atom contains $& neutrons.

D *t is an isotope of the same element as one with an atomic number of $& and a mass number of '&.

7. Which oneof the following lists of electronic structures consists only of atoms of elements in the

same +roup of the eriodic )able?

A !,",$ !,",! !,",' B $ !,$ !,",$

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C !,& !,",$ !,",( D !,! !,",! !,",",!

. A particle consisted of a nucleus with $$ protons and $! neutrons. Around the outside of it were $-

electrons arranged in two levels !,". Which oneof the following statements is not true?

A )he mass number of the particle is !'.

B )he particle isn/t a neutral atom. *t has a

charge of 0$.

C )he particle has a noble gas structure of itselectrons.

D )he particle is a neon atom.

Section !

9. Atoms are made up of three types of particle: proton, neutron and electron.

(a) Which one of these particles has the smallest mass? ......................................................

(b) Which one of these particles has a negative charge?.......................................................

(c) Which two of these particles are present in the nucleus of an atom?

.

(d) Which two of these particles are present in eual numbers in an atom?

..

(e) !sotopes of an element have different numbers of one of these particles. "ame this

particle. .

10.

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11.

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12. Suppose an element has 55 neutrons. Can you identify the element? Why orwhy not? (2)