Atoms of which of the following elements are MOST similar in atomic mass to copper (Cu) atoms?

When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically. Which property of the unknown element determines the other elements it reacts with?

An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom’s nucleus?

How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of 178?

A chemist is identifying the elements present in a sample of seawater. What characteristic of an element’s atoms always determines the element’s identity?

Which of the following list the elements in order, from those having the fewest protons to those having the greatest number of protons?

Which of the following lists contains atoms with the highest reactivity?

What best explains why sodium is more likely to react with another element than an element such as neon?

Which following statements is true?

Elements in a periodic table are arranged from left to right and top to bottom in order of —

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