A chemical element which has the shortest name forms maximum number of isotopes.Identify the element, state its symbol and draw the structure of atom.
An element has electronic configuration x,y such that x,y and xy all are prime numbers.Identify the element, state its symbol and draw the structure of its atom.
An element has 20 electrons and 20 neutrons. It is electrically neutral. State the following-
a) The Atomic number of the element is?
b) The Mass number of the element is?
c) Draw the atomic structure of the element.
An element A has 4 valence electrons in its atom whereas element B has only one valence electrons its atom. The compound formed by A and B does not conduct electricity. What is the nature of chemical bond in the compound formed ? Give its electron dot structure.
Consider the steps for the balancing of a chemical reaction. Identify the correct sequence.
(a) Check the correctness of the balanced equation.
(b) Make the list of number of atoms of different elements present in the unbalanced equation.
(c) Draw the boxes around each chemical formula (for compound/ element).
(d) Choose and balance the second element and so on.
(e) Start balancing from the compound which has more number of atoms and balance the first element.
(f) Write the symbols of physical states for compounds/ elements.