Chemistry 9th Chap 4 : Topic 1 - Maryam Publications

Chemistry Chapter 4 : Topic 1

Modern Periodic Table

1 / 20

The modern periodic table is constructed on a fundamental principle that elements are arranged systematically. Which statement correctly defines this arrangement?

A) Elements are arranged according to increasing atomic mass because it determines chemical behavior directly.

B) Elements are arranged according to discovery date and grouped alphabetically for convenience.

C) Elements are arranged randomly but grouped based on similar physical states at room temperature.

D) Elements are arranged in order of increasing atomic number in periods and groups based on similar properties.

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In the modern periodic table, the position of an element is mainly determined by its atomic number. This means that elements are arranged according to:

A) Mass number only

B) Number of protons in the nucleus

C) Number of neutrons in the nucleus

D) Total number of nucleons

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A student observes that elements in the same group show similar chemical properties. This similarity is mainly due to:

A) Same atomic masses

B) Same number of valence electrons

C) Same number of shells

D) Same number of neutrons

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Periods in the periodic table represent:

A) Diagonal arrangements of elements with similar mass

B) Horizontal rows arranged by increasing atomic number

C) Random placement of elements based on density

D) Vertical columns with similar properties

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Which statement best explains why the modern periodic table replaced the Mendeleev periodic table?

A) Because it is based on atomic number instead of atomic mass

B) Because it only includes metals

C) Because it ignores chemical properties

D) Because it uses alphabetical order of elements

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When elements are arranged in increasing atomic number, periodic repetition of properties occurs because:

A) Mass number remains constant

B) Density follows a fixed pattern

C) Electron configuration repeats periodically

D) Neutrons repeat in pattern

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Group 1 elements (alkali metals) show similar properties because they all:

A) Have two electrons in the outer shell

B) Have identical atomic masses

C) Have full outer shells

D) Have one electron in their outermost shell

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If an element has atomic number 11, its position in the periodic table is determined by:

A) Its mass number

B) Number of neutrons only

C) Number of isotopes

D) Number of protons (11)

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The arrangement of elements in groups leads to:

A) Similar chemical properties within a group

B) Different chemical properties in each group

C) Random distribution of metals and non-metals

D) Decrease in atomic size only

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Which of the following best describes a period in the periodic table?

A) A set of non-metals only

B) A group of elements with identical mass numbers

C) A horizontal row where atomic number increases from left to right

D) A vertical column with identical chemical behavior

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The modern periodic table is considered more accurate than earlier versions because it:

A) Uses only physical state of elements

B) Is arranged randomly for flexibility

C) Ignores chemical properties

D) Is based on proton number which is a fundamental property

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Elements in the same period have the same:

A) Chemical reactivity

B) Atomic mass

C) Number of valence electrons

D) Number of electron shells

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Why are noble gases placed in Group 18?

A) They have full outer electron shells

B) They contain only one electron shell

C) They are highly reactive

D) They have lowest atomic mass

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The periodic law states that properties of elements are periodic functions of:

A) Density

B) Melting point

C) Atomic number

D) Atomic mass

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If elements were arranged by atomic mass instead of atomic number, what major issue would arise?

A) Elements would lose electrons

B) No groups would form

C) Periods would disappear completely

D) Anomalies in element placement would occur

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The similarity of properties in a group is mainly due to similarity in:

A) Atomic mass

B) Valence electron configuration

C) Number of isotopes

D) Number of protons

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Which statement correctly describes the trend across a period?

A) Atomic number decreases

B) Valence electrons remain constant

C) Atomic number increases from left to right

D) Elements become identical

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The main purpose of arranging elements in the periodic table is to:

A) Classify elements based on recurring properties

B) Group elements randomly

C) Separate metals and non-metals completely

D) Memorize elements easily

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Which of the following best explains why hydrogen is placed in Group 1 despite being a non-metal?

A) It has full outer shell

B) It has highest atomic mass in group

C) It is a metal like sodium

D) It has one valence electron

20 / 20

The arrangement of elements in the periodic table helps scientists mainly to:

A) Increase atomic number artificially

B) Convert elements into compounds

C) Predict element properties and behavior

D) Change atomic structure of elements

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