Chemistry, 19.10.2020 05:01 gm2

Element X has two naturally occurring isotopes. The isotope with mass 62.93 amu has a relative abundance of 69.2%. The isotope with mass 64.93 amu has a relative
abundance of 30.8%. Calculate the average atomic mass of Element X. What is the
identity of Element X?

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the average atomic mass is 63.546. The element is copper.

Explanation:
To solve this, you multiply the mass of each isotope by its relative abundance as a decimal (for this question, it would be 62.93 * .692 and 64.93 * .308), then you add the two results together. That gives you the average atomic mass. Then, you look at the periodic table to find which element the mass matches to. If there is none, check your math.

Answer from: Quest

en el barco… .. ¿donde comes? yo como en el comedor del barco

¿qué estás comiendo? estoy comiendo arroz con pollo.

¿que hay en la mesa? en la mesa hay muchos platos y un bonito juego de cubiertos.

¿qué haces en el club de la juventud? me junto con mis amigos y jugamos cartas hasta tarde.

¿qué haces en la piscina? en la piscina, nado con mis amigos.

¿estabas dormido? no, estaba leyendo una revista.

¿qué ves en el teatro? en el teatro veo una obra de lope de vega.

a que hora vives hoy. this is illogical because it means what time do you live today? it should be: ¿ a qué hora vienes hoy? hoy vengo a las 4 de la tarde.

¿a qué hora en el verano? en el verano vengo más temprano.

¿qué llevas puesto hoy? hoy llevo puesto un polo y unos pantalones negros.

¿qué te pones cuando vas a la escuela? me pongo un uniforme y zapatos negros.

¿a dónde vas hoy? hoy voy al cine.

¿mañana? en el barco. mañana voy al gimnasio.

Answer from: Quest

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

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Element X has two naturally occurring isotopes. The isotope with mass 62.93 amu has a relative abun...

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