The molar mass of Sr is 87.62u
(2) An acid is an H+ donor,. and a base is an H+ acceptor.
(3) An acid is an H- acceptor, and a base is an H-donor.
(4) An acid is an H- donor, and a base is an H acceptor.
B) The element is most likely from Group 2A or 3A and in period 2 or 3.
C) The element is most likely from Group 4A or 5A and in period 4 or 5.
D) The element is most likely from Group 6A or 7A and in period 6 or 7
Answer:
The list of answer choices is wrong.
The correct list is:
A) The element is most likely from Group 1A or 2A and in period 1 or 2.
B) The element is most likely from Group 2A or 3A and in period 6 or 7.
C) The element is most likely from Group 4A or 5A and in period 4 or 5.
D) The element is most likely from Group 6A or 7A and in period 2 or 3.
The correct answer is:
Explanation:
The ionization energy increases from left to right on the periodic table. So the elements with higer ionization energies are in the right end of the table. The right most columns are 6A (16) and 7A(17). The column 8A (18) which is that of the noble gases is not normally taken into acccount for this predictions because noble gases are nearly inert.
Hence, the fact that the statement indicates high ionization energy suggests that the element is most likely from group 6A or 7A.
The atomic radius increases from top to bottom, so the smallest elements are in the top rows, which is the periods 1, 2, or 3. The period 1 only has two elements, hydrogen in group 1 and helium in group 8A, so they are not considered in the choices. Thus, that leaves you with the periods 2 or 3.
Adding the two considerations, the conclusion is that the element is most likely from group 6A or 7A and in period 2 or 3.
Answer:
Explanation:
The answer is A) The element is most likely from Group 1A or 2A and in period 1 or 2
Answer: Seafloor and tectonic plates.
Explanation: Seafloor spreading occurs at divergent plate boundaries. As tectonic plates slowly move away from each other, heat from the mantle's convection currents makes the crust more plastic and less dense. The less-dense material rises, often forming a mountain or elevated area of the seafloor
Answer:
Its B, both compounds and mixtures are made up of elements.
B)The nucleus is the dense center of the atom composed of electrons and neutrons. Surrounding the nucleus is an electron cloud composed of protons.
C)The electron cloud is the dense center of the atom composed of electrons. Surrounding the electron cloud is a nucleus composed of protons and neutrons.
Eliminate
D)The electron cloud is the dense center of the atom composed of protons and neutrons. Surrounding the electron cloud is a nucleus composed of electrons.
A is the correct answer I took this tes a few weeks ago.
An atom is structured into a central nucleus containing protons and neutrons, surrounded by an electron cloud that houses the electrons. This is similar to the solar system with the nucleus as the sun and the electrons as the planets revolving around it.
The structure of an atom is organized into two main parts: the nucleus and the electron cloud. The nucleus is the dense central part of the atom and is composed of protons and neutrons. Surrounding the nucleus, in various energy levels or orbits, is a space known as the electron cloud, which contains the electrons.
This structure can be related to the solar system where the nucleus represents the sun and the electrons depict the planets revolving around it. The correct statement that describes the structure of an atom, therefore is option A).
#SPJ6