0
question_answer1) The symbol of an element is\[_{16}{{X}^{32}}\]. (i) How many protons, electrons and neutrons are present respectively? (ii) How many nucleons are present? (iii) What is the total mass of electrons, protons and neutrons present in 1 atom of it? (iv) How many atoms of X are present in 32 grams of X? (v) Write the electronic configuration of X. (vi) How many valence electrons are present in X? (vii) What is the valency of X? (viii) Write the formula of the compound formed by the combination of 'X' and 'O'. (ix) How many electrons are present in L shell of X? (x) Identify the element.
question_answer2) Atomic numbers of elements with hypothetical symbols A, D, C, L, S are 3, 9, 11, 17, 19 respectively. (i) Identify set of elements which have similar chemical properties. (ii) Which set is likely to have metallic character? (iii) Which set is likely to have non-metallic character? (iv) Write the formula of the compound formed by the combination of E and A. (v) Write the formula of the compound formed by the combination of atoms of (a) D (b) L
question_answer3) Three elements S, A, I have atomic numbers 4, 12, 20 respectively. (i) State the number of valence electrons present in each of the elements. (ii) Are these elements going to have similar or dissimilar properties? (iii) Are the elements, metals or non-metals? (iv) Name the groups to which they belong.
question_answer4) Find (i) the total number of electrons, protons, neutrons and (ii) total mass of electrons, protons and neutrons present in 0.12 mg of carbon.
question_answer5) Two elements A and B contain equal number of protons, electrons and neutrons. B contains double the number of electrons, protons and neutrons than in A. A contains 8 electrons in L-shell, B contains 2 electrons in N-shell. Identify A and B.
question_answer6) In an element 'X', 5th electron of 3rd shell is its last electron. In another element 'Y',\[{{\text{7}}^{\text{th}}}\] electron of\[{{\text{3}}^{\text{rd}}}\]shell is its last electron. Then (a) Identify 'X' and 'Y'. (b) Write the formula of the compound formed by the combination of 'X' and 'Y'. (c) What is the atomicity of 'X' and' 'Y'? (d) Find the ratio of number of neutron of 'Y' to 'X'.
question_answer7) Which of the following statements is false? Rewrite it correctly. (a) Mass of a neutron is more than mass of a proton. (b) There is no difference between atomic mass and mass number (c) Isobars differ in the number of neutrons as well as protons.
question_answer8) Identify the following: (a) A uni-negative ion whose configuration is 2, 8, 8 (d) A di-positive ion whose configuration is 2, 8, 8 (c) A di-negative ion whose configuration is 2, 8, 8 (l) A neutral atom whose configuration is 2, 8, 8
question_answer9) There are 10 electrons in each of the species\[{{A}^{+1}}\],\[{{D}^{+2}},{{C}^{+3}}\]. If the number of neutrons in them are 12, 12 and 14 respectively, then choose the right option regarding their atomic number and mass number.
question_answer10) Which of the following statement(s) is (are) correct? (a) Isotopes are the atoms of same element. (b) Isobars are the atoms of different elements. (c) Isotones are the species having same number of neutrons. (d) Isoelectronic species contain same number of electrons. (a) A (b) A, B (c) A, B, C (d) All of these
question_answer11) In which of the following, the ratio of number of electrons present in K-shell to L-shell is 1:2? (a) Hydrogen (b) Beryllium (c) Carbon (d) Oxygen
question_answer12) The electronic configuration of a tripositively charged ion\[({{X}^{+3}})\]is 2, 8. Then (a) (i) Identify the element. (ii) Find the number of neutrons in it. (b) Write the formula of the compound that it forms with chlorine and oxygen respectively. (c) Name the element whose dinegatively charged ion is isoelectronic with\[{{X}^{+3}}\] (d) What is valency of 'X'? (e) Find the number of electrons present in 'M' shell of its neutral atom. (a) (b) (c) (d) (e) \[i\] \[ii\] (a) Boron 10 \[BaC{{l}_{3}}\And {{B}_{2}}{{O}_{3}}\] Oxygen 2 2 (b) Aluminium 14 \[AlC{{l}_{3}}\And A{{l}_{2}}{{O}_{3}}\] Oxygen 3 3 (c) Aluminium 13 \[AlC{{l}_{3}}\And A{{l}_{2}}{{O}_{3}}\] Fluorine 2 3 (d) Boron 9 \[BC{{l}_{3}}\And {{B}_{2}}{{O}_{3}}\] Nitrogen 3 2
question_answer13) In an element 'X', \[{{\text{5}}^{\text{th}}}\] electron of\[{{\text{3}}^{\text{rd}}}\], shell is its last electron. In another element 'Y',\[{{7}^{th}}\] electron of\[{{\text{3}}^{\text{rd}}}\]shell is its last electron. Then (a) Identify 'X' and 'Y'. (b) Write the formula of the compound formed by the combination of 'X' and 'Y'. (c) What is the atomicity of 'X' and' 'Y'? (d) Find the ratio of number of neutrons of 'Y' to 'X'. \[\frac{A}{2Z}=1\Rightarrow A=2Z\] \[a\] \[b\] \[c\] \[d\] \[X\] \[Y\] \[X\] \[Y\] (a) Phosphorus Chlorine \[X{{Y}_{3}}\] 4 2 9:8 (b) Phosphorus Chlorine \[X{{Y}_{2}}\] 3 2 7:8 (c) Boron Fluorine \[X{{Y}_{3}}\] 4 2 9:8 (d) None
Please Wait you are being redirected....
You need to login to perform this action.You will be redirected in 3 sec
OTP has been sent to your mobile number and is valid for one hour
Your mobile number is verified.
