Periodic Table Quiz

The elements X, Y, and Z belong to the same period of the Modern Periodic Table. X is a metal, Y is a metalloid, and Z is a non-metal. (a) Write the trend in their metallic character across the period. (b) Which of them will form a cation and why? (c) Which one has the highest ionisation energy? (d) Predict the nature of their oxides. (e) What kind of bond is expected between X and Z?

The atomic numbers of four elements A = 3, B = 7, C = 10, and D = 12. (a) Identify the group and period of element B. (b) Which elements are likely to form ionic compounds? (c) Arrange the elements in increasing order of metallic character. (d) Which of these elements has a complete octet in the ground state? (e) Justify your answer using their electronic configurations.

Elements P, Q, and R have atomic numbers 11, 15, and 17 respectively. (a) Write their electronic configurations. (b) Identify the group and period of each. (c) Which element is most reactive non-metal? Why? (d) Which of these will form a basic oxide? Explain. (e) Predict the type of bond likely to be formed between P and R.

Explain the following using the trends in the periodic table: (a) Why does atomic size decrease from left to right across a period? (b) Why do alkali metals form +1 ions easily? (c) Why are the noble gases unreactive? (d) Why is fluorine more reactive than chlorine? (e) Why does the valency remain the same down a group?

The elements in Group 17 show a gradual change in physical and chemical properties. (a) Why does the reactivity decrease down the group? (b) Which halogen can displace others from their salt solutions? (c) Name the type of bond halogens form with metals and non-metals.

Why is the ionisation energy of sodium lower than that of magnesium, even though both are metals in the same period?

An element E has 2 electrons in its outermost shell and belongs to period 3. Predict: (i) Its group number (ii) Nature of oxide it forms (iii) Its metallic or non-metallic character

Explain why elements in the same group have similar chemical properties, but differ in physical properties.

Elements A, B, and C belong to the same period of the Modern Periodic Table. A has 1 valence electron, B has 4, and C has 7. (a) Which element is the most metallic and why? (b) Arrange them in increasing order of atomic radius. (c) Predict the type of bonding between A and C. Explain your answer.

The following data is given for elements from the second and third periods: Element Atomic Number X. 11 Y 15 Z 17 (a) Identify the group numbers of these elements. (b) Write the general formula of their oxides. (c) Which of these elements has the highest electronegativity? Justify. (d) Between Y and Z, which one forms a covalent compound with hydrogen? Why?