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Mass numbers of Li, Be and B are 7, 9 an...

Mass numbers of Li, Be and B are 7, 9 and 10 respectively. Among `B^(+), Be^(2+), Li^(+)`, Be Which has two electrons, three protons and four neutrons

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Li
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Mass numbers of Li, Be and B are 7, 9 and 10 respectively. Which of the following has two electrons, three protons and four neutrons?

Mass numbers of Li, Be and B are 7,9 and 10 respectively. Which of the following has two electrons, three protons and four neutrons ?

Knowledge Check

  • The mass numbers of two elements X and Z are 52 and 75 respectively . X contains 16.6% more neutrons compared to protons . Z contains 27.3% more neutrons compared to protons . X and Z are respectively

    A
    `""_(24)Cr_(133)` AS
    B
    `""_(24)Cr_(130)` Zn
    C
    `""_(19)K_(133)` AS
    D
    `""_(29)Cu_(130)` Zn

  • Calculate the number of protons, neutrons and electrons respectively in ""_(7)^(14) N^(3-)

    A
    `7, 10 ,7`
    B
    `7, 7, 10`
    C
    `10, 7, 7`
    D
    `7, 7, 7`

  • A uniform rectangular block of mass 50 kg is hung horizontally with the help of three wires A, B and C each of length and area of 2 m and 10 mm^2 respectively as shown in the figure. The central wire is passing through the centre of gravity and is made of a material of Young's modulus 7.5 xx 10^10 Nm^(-2) and the other two wires A and C symmetrically placed on either side of the wire B are of Young's modulus 10^11 Nm^(-2) . The tension in the wires A and B will be in the ratio of

    A
    `1:3`
    B
    `4:3`
    C
    `5:3`
    D
    `7:3`

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