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Question 18N.1.SL.TZ0.25

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Date November 2018 Marks available [Maximum mark: 1] Reference code 18N.1.SL.TZ0.25
Level SL Paper 1 Time zone TZ0
Command term Question number 25 Adapted from N/A
25.
[Maximum mark: 1]
18N.1.SL.TZ0.25

The graph shows the variation of the number of neutrons N with the atomic number Z for stable nuclei. The same scale is used in the N and Z axes.

Which information can be inferred from the graph?

I.   For stable nuclei with high Z, N is larger than Z.

II.  For stable nuclei with small Z, N = Z.

III. All stable nuclei have more neutrons than protons.

 

A.   I and II only

B.   I and III only

C.   II and III only

D.   I, II and III

[1]

Markscheme

A

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