La selección de 16 estudiantes de olimpiadas de matemáticas, para sus preparaciones resolvieron 59 problemas. Cada problema fue resuelto solamente por un estudiante, además hay cuatro estudiantes que resolvieron exactamente 1, 2, 3, o 4 problemas, respectivamente. Muestra que algún estudiante resolvió al menos 5 problemas.

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step-by-step explanation:

alright well the answers to your question is

2xy/9 hope this have a nice day : )

step-by-step explanation:

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.