Click friends For a market research, a questionnaire on the use of three devices is submitted to the students of a class: computer, tablet, smartphone. The answers show that all the children use at least one tool, namely: 18 children have computers; 19 the tablet; 13 the smartphone; 11 the computer and the tablet; 8 the tablet and smartphone; 9 the computer and smartphone; 7 all three appliances. Determine how many students have: to. the smartphone and the computer, but not the tablet; b. only the smartphone. c. How many students are in the class?

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.

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step-by-step explanation: