Use Mendeleev’S Periodic Table to Predict the Formulae for the Oxides of the Following Elements: K, C, Al, Si, Ba. - Science


 Use Mendeleev’s Periodic Table to predict the formulae for the oxides of the following elements:
K, C, Al, Si, Ba.



K is in group 1. Therefore, the oxide will be K2O.
C is in group 4. Therefore, the oxide will be CO2.
Al is in group 3. Therefore, the oxide will be Al2O3.
Si is in group 4. Therefore, the oxide will be SiO2.
Ba is in group 2. Therefore, the oxide will be BaO.

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Chapter 5: Periodic Classification of Elements - Intext Questions [Page 85]


NCERT Science Class 10
Chapter 5 Periodic Classification of Elements
Intext Questions | Q 1 | Page 85


What are the main features of Mendeleev’s periodic table?

Name three elements that have a single electron in their outermost shells.

Name three elements with filled outermost shells.

Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?

State any three demerits of Mendeleev’s periodic table.

Name the Russian chemist who said that the properties of elements are a periodic function of their atomic masses.

What were the two criteria used by Mendeleev to classify the elements in his periodic table?

What chemical properties of elements were used by Mendeleev in creating his periodic table?

Why is atomic number considered to be a more appropriate parameter than atomic mass for the classification of elements in a periodic table? How does the metallic character of elements vary as we move (i) from left to right in a period, and (ii) top to bottom in a group in the modern periodic table? Give reasons to justify your answers.



Write a short note.
Mendeleev’s periodic law.

Write the merits of Mendeleev’s periodic table.

Mendeleev's contributions to the concept of a periodic table laid the foundation for the Modern Periodic Table. Give reasons.

State Mendeleev's periodic law.

Why did Mendeleev's leave some gaps in his periodic table os elements? Explain your answer with an example.

Name an element whose properties were predicted on the basis of its position in Mendeleev's periodic table.

Name two elements whose atomic weights were corrected on the basis of their positions in Mendeleev's periodic table.

How many elements were known at the time of Mendeleev's classification of elements?

Answer the following question:

Name two elements having a single electron in their outermost shell. 

What are the demerits of Mendeleev’s periodic table?

What was the basis of Mendeleev's classification?

How did Mendeleev's arrangement of elements correlate with the periodicity of the properties of elements?

State the contributions made by Mendeleev towards the periodic table.

Give a reason for the following:

Mendeleev's contributions to the periodic table laid the foundation for the Modern Periodic Table.

According to Mendeleev’s periodic law, properties of elements are periodic function of their _______.

At the time of Mendeleev _______ elements were known.

In Mendeleev’s periodic table eka- silicon was later named as _______.

Beryllium : alkaline earth metal : : sodium: _______

Write the molecular formula of the oxide of any one of the elements in Mendeleev’s periodic table.

According to Mendeleev’s periodic law properties of elements are ______.

While designing the periodic table, Mendeleev considered the chemical and physical properties of the elements.

Write scientific reason.

Mendeleev kept vacant places in the periodic table.

State Mendeleev’s Periodic Law.

Distinguish between:

Mendeleev’s periodic table - Modern periodic table

On which basis Mendeleev organised periodic law?

What physical and chemical properties of elements did Mendeleev consider in compiling the periodic table?

What challenges did Mendeleev face in following periodic law?

What are the limitations of Mendeleev's periodic table?

The properties of eka-aluminum predicted by Mendeleev are the same as the properties of a later discovered elements: ______

An element has 12 protons. The group and period to which this element belongs is ______

Write the formulae of chlorides of Eka-silicon and Eka-aluminium, the elements predicted by Mendeléev.

State Mendeleev’s Law of Periodicity.

List the features of Mendeleev’s Periodic Table.

Mendeleev's periodic table was based on ______.


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