The number of electrons in an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of the element?
(a) 15 X 31
(b)16 X 31
(c) 15 X 16
(d) 16 X15
1 Answers
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The atomic number of an element is 5 and mass number is 11. Find the number of electrons, protons and neutrons present in an atom of it.
Number of electrons (Z = 5) = 5 Number of protons (Z = 5) = 5 Number of neutrons (A = Z) = 11 – 5 = 6 Since the atomic number is...
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Compare the properties of electrons, protons and neutrons.
Particle Nature of Charge Mass Location Electron Electrons are negatively charged. 9 x 10–31 kg Extra nuclear part distributed in different shell or orbits. Proton Protons are negatively charged. 1.672 x 10–27 kg (1 μ) (approx. 2000 times that of...
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Which of the following are true for an element? (i) Atomic number = number of protons + number of electrons
(d) (ii) and (iv)
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The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14.
(b) 10 ..........
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In a sample of ethyl ethanoate (CH3COOC2H5 ) the two oxygen atoms have the same number of electrons but different number of neutrons
(c) The two oxygen atoms are isotopes
1 Answers 1 views
Calculate the number of neutrons present in the nucleus of an element X which is represented as 31 15 X
Mass number = No. of protons + No. of neutrons = 31 ∴ Number of neutrons = 31– number of protons ...
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There are 15 protons and 16 neutrons in the nucleus of an element. Calculate its atomic number and mass number.
Atomic number of any element is the number of proton present in that atom Here, number of proton = 15 therefore atomic number is also 15. Mass number or atomic mass is...
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An element 'X' has mass number 35 and number of neutrons 18.
Atomic number of X = Mass number of X - Number of neutrons =35-18=17 Therefore, electronic configuration of X = 2, 8, 7 Group number = 17 Period number = 3 Valency=8-7=1
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An element ‘X’ has mass number 35 and the number of neutrons, is 18. Identify the group number and period of ‘X’.
Atomic number of X = Mass number of X – Number of neutrons = 35–18=17 Electronic configuration = 2, 8, 7 Group number = Valence electrons +10 = 17 Period =...
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An element “X” has mass number 35 and the number of neutrons, is 18. Identify the group number and period of “X”?
Atomic number of X = Mass number of X – No. of neutrons =35 18=17 Electronic configuration = 2, 8, 7 Group number = 17 , Period No. = 3
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