Which of the following is not an essential element of a valid custom?

Keep practicing — related questions

• Which of the following is not an aspect of quality?
• The term "transition elements" most commonly refers to the d-block transition elements. Which of the follow...
• Elements having the same number of valence electrons are placed in the same group. Elements having valence ...
• The prediction of Mendeleev regarding the discovery of some elements were exact. Which of the following ele...
• Which of the following elements, valence electrons and their position in the modern periodic table are corr...
• Which of the following vitamins is required for strong bone and teeth?
• Which of the following is essential for forming hemoglobin in the blood?
• The atomic number of which of the following elements represents a metal?