Question

Elements of modern periodic table are arrang in ---Group 2A elements are called ------ and group 7A element table are called..........., respectively, a. atomic number /Alkaline earth metals/noble gases b. atomic number /alkali metals / alkaline earth metals atomic number /Alkaline earth metals/ and halogens d. Atomic mass /alkali metals/noble gases c.

Answer 1

The modern periodic table arranges elements by atomic number; Group 2A consists of alkaline earth metals, and Group 7A contains halogens.

Step-by-step explanation:

The elements of the modern periodic table are arranged by increasing atomic number. Group 2A elements are called alkaline earth metals, and they are known for forming basic or alkaline solutions when dissolved in water. Moving to Group 7A, these elements are called halogens, which are highly reactive nonmetals with seven electrons in their outermost shell.

The correct answer to the student's question is therefore: 'Elements of the modern periodic table are arranged by atomic number, Group 2A elements are called alkaline earth metals, and Group 7A elements are called halogens.'

Answer 2

c) atomic number / alkaline earth metals/ and halogens

Step-by-step explanation:

Elements of modern periodic table are arrang in atomic number; for its electron configuration and its chemical properties. This arrangement shows periodic trends.

Alkaline earth metals are a group of elements that are located in group 2 of the Periodic Table and are the following: Beryllium (Be), Magnesium (Mg), Calcium (Ca), Strontium (Sr), Barium (Ba) and Radio (Ra).

The Halogens are the chemical elements that form group 17 (XVII A, previously used) or group VII A of the periodic table: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At) and teneso (Ts)