The modern periodic table has:
7 periods and 18 groups
The modern or long-form periodic table is based on Moseley's periodic law that properties of elements are a periodic function of their atomic number; in this table the horizontal rows are called periods and there are seven such periods numbered 1 to 7.
The vertical columns are called groups and there are eighteen groups numbered 1 to 18, which cover the s-, p-, d- and f-blocks, so the modern periodic table has 7 periods and 18 groups.
Hence, 7 periods and 18 groups.
Similar Questions
The element with the symbol K is:
Which of the following pairs is correctly matched?
Which of the following element symbols does NOT match its element?
Which of the following statements is/are true?
A. Out of 114 elements, 32 are non-metals and others are metals.
B. Every ore is a mineral but every mineral is not an ore.What is the characteristic of Rare Earth Elements?
Which of the following is NOT a feature of Mendeleev's periodic classification?
Which elements were named by Mendeleev by adding the prefix 'Eka' before the name of the preceding element in the same group?
In Mendeleev's periodic table, the horizontal rows are called:
Group ____ contain non-reactive gases.
The chemical properties of the element having which of the following atomic numbers are similar to magnesium?
Important Questions from Periodic Table
The correct order of decreasing electron gain enthalpy with negative sign for chalcogens is - Identify
Modern periodic table has:
Bisphenol A (BPA), a cause of concern, is a structural/key component in the manufacture of which of the following kinds of plastics?
‘Triclosan’, considered harmful when exposed to high levels for a long time, is most likely present in which of the following?
____________ is also known as Quick lime.
