Which of the following is the first element of the modern periodic table?a)Heliumb)Lithiumc)Hydrogend)Carbone)None of the above/More than one of the aboveCorrect answer is option 'C'. Can you explain this answer?

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Which of the following is the first element of the modern periodic table?

a)
Helium
b)
Lithium
c)
Hydrogen
d)
Carbon
e)
None of the above/More than one of the above

Correct answer is option 'C'. Can you explain this answer?

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Which of the following is the first element of the modern periodic tab...

Hydrogen is the first element of the modern periodic table. This is because its atomic number is one.
IMPORTANT FACTS
MODERN PERIODIC TABLE-

“The physical and chemical properties of the elements are periodic functions of their atomic numbers”.
In modern periodic table is based on modern periodic law in which elements are arranged in increasing order of their atomic numbers.
In the modern periodic table, the elements are arranged in rows and columns. These rows and columns are known as periods and groups respectively.

Groups - There are 18 vertical columns in the periodic table. Each column is called a group. All elements in a group have similar chemical and physical properties because they have the same number of outer electrons.
Periods - There are 7 periods in the periodic table. Elements of the same period have the same number of electron shells.

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Community Answer

Which of the following is the first element of the modern periodic tab...

Hydrogen is the first element of the modern periodic table. This is because its atomic number is one.
IMPORTANT FACTS
MODERN PERIODIC TABLE-

“The physical and chemical properties of the elements are periodic functions of their atomic numbers”.
In modern periodic table is based on modern periodic law in which elements are arranged in increasing order of their atomic numbers.
In the modern periodic table, the elements are arranged in rows and columns. These rows and columns are known as periods and groups respectively.

Groups - There are 18 vertical columns in the periodic table. Each column is called a group. All elements in a group have similar chemical and physical properties because they have the same number of outer electrons.
Periods - There are 7 periods in the periodic table. Elements of the same period have the same number of electron shells.

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Which of the following is the first element of the modern periodic table?a)Heliumb)Lithiumc)Hydrogend)Carbone)None of the above/More than one of the aboveCorrect answer is option 'C'. Can you explain this answer?

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