An element โXโ has mass number 4 and atomic number 2. Write the valency of this element. Will it react with other atoms of different elements? Open Answer ยป
Explain why chlorine whether as the element or its compounds, always has relative atomic mass of about 35.5. Open Answer ยป
Complete the following gaps in the given table:ElementsProtonsElectronsNeutronsAtomic NumberMass NumberA––108–B15–––31C1–––3D–1112–– Open Answer ยป
An atom โMโ of an element reacts wit oxygen to from M2O3. Calculate the valency of the element โMโ. Open Answer ยป
Composition of the nuclei of two atomic species โXโ and โYโ are given below:XYProtons88Neutrons810Give the mass number of โXโ and โYโ What is the relationship between the two species? Open Answer ยป
One electron is present in the outermost shell of an element โZโ (a) What will be the nature of this element? (b) What will be value of charge of the ion formed, if this electron is removed from the outermost shell? Open Answer ยป
An old man and a scientist were talking about a deserted house. The old man was sure that it was haunted by ghosts, but the scientist discarded the view saying no one had ever seen a ghost. The old man was annoyed and challenged the scientist about existence of atoms, sub-atomic particles which also could not be seen. (๐) Name the three sub-atomic particles and their discoverers. (๐๐) Whose viewpoint do you support and why? Open Answer ยป
Rutherford’s atomic model was a reasonably good model of structure of atom based on at the famous particle scattering experiment. However, it was subsequently modified by Neils Bohr and later on, by others. The resulting improvements in the understanding of atomic structure have greatly contributed to further scientific advancement. There are many other similar examples in scientific field when original contributors happily accept modifications in their ideas. Answer the following questions based on the above information: (๐) Name the scientific values associated with above anecdotes. (๐๐) Give any example from your life experiences so far which reflects display of such a value by you as an individual. (๐๐๐) In what way such a personal attribute is likely to help you? Open Answer ยป
The given figure depicts the atomic structure of an atom of an element ‘Xโ. Write the following information about the element ‘Xโ. (a) Atomic number of โXโ (b) Atomic mass of โXโ (c) Valence electrons (d) Valency of โXโ (e) ‘X’ should be metal or non-metal. Open Answer ยป