Question

(02.02 lc)
mendeleev used his arrangement of elements in order of increasing mass and repeated properties to predict the mass and properties of undiscovered elements.

a true

b false

question 2 (1 point)
(02.02 lc)
mendeleevs arrangement of elements in the periodic table was based on the observations and experiments of his predecessors who studied the mass and properties of elements.

a true

b false

question 3 (1 point)
(02.02 lc)
mendeleevs periodic table shocked the scientific community because it contradicted earlier findings about element mass and properties.

a true

b false

question 4 (1 point)
(02.02 mc)
using the periodic table, which of the following elements is most likely to have similar properties as calcium, and why?

a potassium (k), because they are both alkali metals

b magnesium (mg), because they are both alkaline earth metals

c scandium (sc), because they are both in the fourth period

d argon (ar), because they both have three energy levels

Explanation:

• Question 1: Mendeleev arranged elements by increasing mass and periodic - repeating properties to predict new elements. This is a well - known fact in the history of the periodic table.
• Question 2: Mendeleev built on the work of his predecessors who studied element mass and properties to create his periodic table.
• Question 3: Mendeleev's periodic table was in line with earlier work and refined it, not contradicted it.
• Question 4: Elements in the same group have similar chemical properties. Calcium and magnesium are both alkaline earth metals (Group 2) and thus have similar properties.

Answer:

1. a. True
2. a. True
3. b. False
4. b. Magnesium (Mg), because they are both alkaline earth metals