1. List three things that all the atoms of the elements in period 3 have in common.

Identify these elements based on their locations in the periodic table. Give the symbol, not the name. period 6, group 13 (3A) period 5, group 12 (2B) period 2, group 18 (8A)

(1) are composed of only one type of atom and we form (2) when we combine two or more of it. These atoms combine and stick to each other because of (3). Two or more (4). that are not chemically combined make up a (5) Its composition could be uniform as (6) which is also known as (7) and can also be non-uniform, which are called (8) These can further be classified into either (9) or (10). The characteristics that matter exhibit is better known as its (11)_ (12) are characteristics that could only be observed with a change in the molecular composition while (13). are the ones that doesn't require it. Furthermore, characteristics that change when the mass changes are called (14)_ while characteristics that are independent from these changes are called (15)

In the periodic table, elements are organized based on their atomic numbers and properties. One of the most significant features of the periodic table is the periodicity in the properties of elements. For example, elements in the same group often exhibit similar chemical behaviors due to having the same number of valence electrons. Consider the halogens, which include fluorine, chlorine, bromine, iodine, and astatine. These elements are found in Group 17 and are known for their high reactivity, particularly with alkali metals and alkaline earth metals, forming salts. Their reactivity decreases as you move down the group. Which of the following statements best explains the reason for the decreasing reactivity of halogens as you move down Group 17? A. The atomic radius decreases, making it harder for the halogens to gain electrons. B. The atomic radius increases, making it easier for the halogens to gain electrons. C. The ionization energy increases, making it easier for the…

Does any element with Z ≤ 92 match the description? A halogen with a lower atomic number than silicon.

Identify these elements based on their locations in the periodic table. Give the symbol, not the name.

A neutral atom of chlorine-37 has protons, neutrons, and electrons. Silicon and lead are an example of two elements that belong to the same Select one: class. gender. group. period. Which set below includes only alkali metal elements? gallium, germanium, iron, barium, tellurium lithium, sodium, potassium, rubidium, francium magnesium, gallium, flluorine, mercury, neptunium radium, polonium, actinium, platinum, selenium