The nuclide notation for the isotope lithium-7 is $$\({ }_{3}^{7} \mathrm{Li}\)$$. How many neutrons are there in an atom of lithium-7?
A.
3
B.
4
C.
7
D.
10
Exam No：0625_w18_qp_12 Year：2018 Question No：38
Answer:
B
Knowledge points:
1.1.1 Describe the use of rulers and measuring cylinders to find a length or a volume
1.1.2 Describe how to measure a variety of time intervals using clocks and digital timers
1.1.3 Determine an average value for a small distance and for a short interval of time by measuring multiples (including the period of oscillation of a pendulum)
1.1.4 Understand that a scalar quantity has magnitude (size) only and that a vector quantity has magnitude and direction
1.1.4 (old) Understand that a micrometer screw gauge is used to measure very small distances
1.1.5 Know that the following quantities are scalars: distance, speed, time, mass, energy and temperature
1.1.6 Know that the following quantities are vectors: force, weight, velocity, acceleration, momentum, electric field strength and gravitational field strength
1.1.7 Determine, by calculation or graphically, the resultant of two vectors at right angles, limited to forces or velocities only
5.1.1.1 Describe the structure of an atom in terms of a positive nucleus and negative electrons
5.1.1.2 Describe how the scattering of α-particles by thin metal foils provides evidence for the nuclear atom
5.1.2.1 Describe the composition of the nucleus in terms of protons and neutrons
5.1.2.2 State the charges of protons and neutrons
5.1.2.3 Use the term proton number Z
5.1.2.4 Use the term nucleon number A
5.1.2.5 Use the term nuclide and use the nuclide notation
5.1.2.6 Use and explain the term isotope
5.1.2.7 State the meaning of nuclear fission and nuclear fusion
5.1.2.8 Balance equations involving nuclide notation
Solution:
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