Which of the following best helps to explain why the electron affinity for Be is less favorable than the electron affinity for Li?
Choose 1
O) The electron added to Be experiences a greater effective nuclear charge than the electron added to
Li experiences.
O) The electron added to Be is shielded by more core electrons than the electron added to Li is.
O) The electron added to Be goes into a higher energy orbital than the electron added to Li goes into.
O) The electron added to Be goes into a higher electron shell than the electron added to Li goes into.

Which of the following is in the lanthanide family? a) uranium b) promethium c) silver d) gold

Can anyone explain 1. review your spectrometry data and use the known elements to identify the star's composition. which unknown elements make up this star? justify your element selections. 2. in parts i and ii of the lab, what happened to the electrons of each element to produce the different colors of light? explain your answers using important terms from the lesson and information provided in the laboratory. 3. stars composed of heavier (more massive) elements are often slightly older than stars made predominantly from hydrogen and helium. based on your data, is the newly discovered star a younger star? explain your answer.

Bridget is in science class. her teacher gives her two unknown substances and asks her to determine their relative ph. she places a piece of red litmus paper into both substances. the litmus paper turns purple when she places it into substance i. the litmus paper turns blue when she places it into substance ii. a. substance i is a neutral substance and substance ii is an acid. b. substance i is a neutral substance and substance ii is a base. c. substance i is an acid and substance ii is a base. d. substance i is a base and substance ii is a neutral substance.