Table of Contents
- 1 What are two uses for Group 2?
- 2 What are the 2 group elements?
- 3 Which of the following are uses for Group 2 compounds?
- 4 What properties does Group 2 have?
- 5 What are representative elements give two examples?
- 6 What are representative elements give reasons?
- 7 Which is the best method for selecting a representative sample?
- 8 How is the size of a sample related to its representativeness?
What are two uses for Group 2?
Some important uses of alkaline earth metals are:
- Be is used in the manufacture of alloys. Cu-Be alloys are used in the preparation of high strength springs.
- Mg is used to prepare alloys with Al, Zn, Mn and Sn.
- Ca is used in the extraction of metals from their oxide.
- Radium salt are used in radiotherapy.
What are the 2 group elements?
alkaline-earth metal, any of the six chemical elements that comprise Group 2 (IIa) of the periodic table. The elements are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
What are the representative groups of the periodic table?
The representative elements occur in groups 1, 2, and 12–18. These elements are representative metals, metalloids, and nonmetals.
What are representative elements examples?
List of Representative Elements in P Block
- Boron (B)
- Aluminum (Al)
- Gallium (Ga)
- Indium (In)
- Thallium (Tl)
- Carbon (C)
- Silicon (Si)
- Germanium (Ge)
Which of the following are uses for Group 2 compounds?
Group 2 compounds are often used to neutralise acidity. Calcium hydroxide, often known as slaked lime, is used in agriculture to neutralise acidic soil, and magnesium hydroxide is often used in indigestion tables to neutralise excess stomach acid….
| Group 2 Element | First ionisation energy (kJmol-1) |
|---|---|
| Barium (Ba) | 503 |
What properties does Group 2 have?
These physical properties of group 2 elements are:
- low density (mass over volume)
- low melting points (except beryllium)
- low boiling points (except beryllium)
- soft and strong in their metal states.
- ductile.
- malleable.
- shiny and silvery as metals.
- dull appearance.
What are representative groups?
The Representative Elements are those elements within the first two families (Groups I and II on the far left) and the last six families or groups (on the right) of the Periodic Table. The Transition Metals are the elements in those Groups within the middle of the Table.
Why are representative elements called so?
The elements of “s” and “p” blocks except “d” group elements are called as representative elements because Their outer shells are not completely filled with electrons and The elements get the nearest inert gas configuration by losing or gaining or sharing of electrons. They are chemically active.
What are representative elements give two examples?
Answer: In chemistry and atomic physics, the main group is the group of elements (sometimes called the representative elements) whose lightest members are represented by helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, and fluorine as arranged in the periodic table of the elements.
What are representative elements give reasons?
The elements of “s” and “p” blocks except “d” group elements are called as representative elements because Their outer shells are not completely filled with electrons and The elements get the nearest inert gas configuration by losing or gaining or sharing of electrons.
What is the importance of a representative sample?
What is more important here is to get a good representative sample, so that the vast majority of your time and energy will go into getting responses from a small group of people who will represent a larger population. Time and again, research studies have employed a smaller group of people to conduct studies, collect data, and analyze the results.
How are elements placed in groups on the periodic table?
How Elements are Placed into Groups. Well, check this out. Each group number for the representative elements corresponds to how many valence electrons an element has. So, all of the elements in group 2A have two valence electrons; all of the elements in group 5A have five valence electrons.
Which is the best method for selecting a representative sample?
For a participant to be considered a probability sample, he/she must be selected using a random selection. If we will use probability sampling to obtain a representative sample, then simple random sampling is the best choice.
More than size, representativeness is related to the sampling frame, that is, to the list from which people are selected, for example, part of a survey. Therefore, we must take care that people from our target audience are included in that list to say that it is a representative sample.