Mendeleev gave the name eka-aluminum to an A. compound containing aluminum. B. mixture of aluminum and an unknown element. C. un
known element he predicted would have properties similar to those of aluminum. D. rare isotope of aluminum.
2 answers:
Mendeleev gave the name eka-aluminum to an <u><em>C. unknown element he predicted would have properties similar to those of aluminum </em></u>
<h3>Further explanation </h3>The periodic system of elements is an arrangement of elements classified based on similar properties and their atomic number order.
The periodic system is divided into groups (vertical order) and periods (horizontal order)
There are some scientists who do the grouping of elements, mostly based on the relative atomic mass
- 1. Dobereiner
These scientists grouped the elements into groups of three elements called the Triade
- 2. Newlands
These scientists arrange elements based on their relative atomic mass increases called the octave law. Similarities between the elements occur in elements that have a difference of 1 octave (elements 1 and 8, elements 2 and 9, elements 3 and 10 etc.)
- 3. Mendeleev
These scientists group elements based on their relative atomic mass increases.
Mendeleev placed elements that have similar properties in one group (vertical direction) and based on the increase in relative atomic mass in one period
In the periodic system made by Mendeleev, there are some parts in the group that are left blank because the element has not been found but is predicted to have the same properties as the elements in that group.
The Mendeleev periodic system is useful after the discovery of new elements which had similar properties in accordance with Mendeleev's predictions.
In group III, under the Al element, Mendeleev empties the unknown element, but it is predicted to have similar properties with aluminum and is given the name eka-aluminum. This element was later discovered and named gallium (Ga) with atomic number 31 and relative atomic mass of 69.72
<h3>Learn more </h3>
electron affinity
Identify the group number in the periodic table
the charge on each ion in the compounds
Keywords: element, group, period, eka-aluminum, gallium, periodic system
You might be interested in
Answer:
<em> The object has frequency of 2 Hz and time period of 0.5 s.</em>
Explanation:
<em>Frequency</em> is defined as number of oscillation per second ie back and forth swings done in single second.
Here it is given that the object oscillates 20 times in 10 seconds.
So f = = 2Hz
The <em>time period</em> is defined as time taken by the object to complete one full oscillation.
T =
T= =0.5 s
<em>Thus the object has frequency of 2 Hz and time period of 0.5 s.</em>
Answer:
the position of the wood below the interface of the two liquids is 2.39 cm.
Explanation:
Given;
density of oil, = 926 kg/m³
density of the wood, = 974 kg/m³
density of water, = 1000 kg/m³
height of the wood, h = 3.69 cm
Based on the density of the wood, it will position across the two liquids.
let the position of the wood below the interface of the two liquids = x
Let the wood be in equilibrium position;
Therefore, the position of the wood below the interface of the two liquids is 2.39 cm.