Advertisements
Advertisements
Question
An element Z has atomic number 16. Answer the following
(a) State the period and group to which Z belongs
(b) Is Z a metal or a non-metal?
(c) State the formula between Z and hydrogen.
(d) what kind of a compund is this?
Solution
An element Z having atomic number 16 is Sulphur.
a) Sulphur belongs to Period 3 and Group 16.
b) Sulphur is a non-metal.
c) The formula between Z and hydrogen is H2S.
d) Two hydrogen atoms combine with one sulphur atom to form hydrogen sulphide (H2S) gas.
APPEARS IN
RELATED QUESTIONS
How do the atomic size and metallic character of elements vary as we move :-
(a) down a group and
(b) from left to right in a period
Write the number of periods the Modern Periodic Table has. State the changes in valency and metallic character of elements as we move from left to right in a period. Also state the changes, if any, in the valency and atomic size of elements as we move down a group.
Based on the group valency of elements state the formula lot the following giving justification for each :-
(i) Oxides of 1st group elements,
(ii) Halides of the elements of group 13, and
(iii) Compounds formed when an element of group 2 combines with, an element of group 16.
An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.
Is it more or less reactive than calcium?
How many groups and periods are there in the modern periodic table?
Explain
Size of atom changes when it loses or gain electron
The following table represents the first period of the modern periodic table. Study the table and answer the questions that follow:
(i) Write the formula of the sulphate of the element with atomic number 13.
(ii) What type of bonding will be present in the oxide of the element with atomic number 1?
(iii) Which feature of the atomic structure accounts for the similarities in the chemical properties of the elements in group VIIA of the periodic table?
(iv) Name the element which has the highest ionization potential.
(v) How many electrons are present in the valence shell of the element with atomic number 18?
(vi) What is the name given to the energy released, when an atom in its isolated gaseous state accepts an electron to form an anion?
(vii) What is the electronic configuration of the element in the third period which gains one electron to become an anion?
(viii) Fill in the blanks:
The atomic size ______ as we move from left to right across the period, because the ______ increases, but the ______ remains the same.
Formula of ion of A is A2+. Element A probably belongs to ______ group.
An element belongs to the third period and Group IIIA (13) of the periodic table. State: if it is a metal or non-metal?
Based on the group valency of element write the molecular formula of the following compound giving justification:
Oxide of first group elements.
