It's in the cards discovering the periodic law lab answers

Asked by wiki @ 22/11/2021 in Chemistry viewed by 841 People

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Elements on the periodic table appear together in regions based on the energy sub-level that contains their outermost valence electrons. What are these regions called?
families
blocks
main-group elements
transition elements
Mendeleev's periodic law has been restated to say that when the elements are arranged in order of increasing atomic number, there is a periodic pattern in their chemical and physical properties.
True
False
In 1894, William Ramsey discovered the first of several non-reactive elements. Which group of elements did Ramsey discover that would alter the structure of the periodic table?
the transition metals
the noble gases
the halogens
the alkali metals
Which of the following elements is man-made?
platinum
technetium
radon
cesium
What is the name of the group (family) that includes the elements radium, strontium, and magnesium?
noble gases
metals
alkaline earth metals
alkali metals
An element's atomic number is an indicator of its atom's:
number of protons
number of neutrons
charge
weight
An atom of oxygen contains 8 protons, 8 electrons, and 16 neutrons.
True
False
Which of the following is NOT true of electronegativity?
generally increases as atomic radius decreases within a period
generally decreases as atomic number increases within a period
generally decreases as the principal energy level increases within a group
generally increases as atomic radius decreases within a group
Which of the following elements possesses the most valence electrons?
argon
fluorine
helium
plutonium
How many dots should be drawn around the symbol, C, to create the Lewis dot structure for a carbon atom?
two
four
six
eight
To achieve an octet in the valence energy level, a nitrogen atom will lose five electrons.
True
False
To achieve an octet in the valence energy level, a sulfur atom will become a cation.
True
False

Answered by wiki @ 22/11/2021

1) the elements which are arranged in regions on the basis of energy sub level are called blocks

Example: the family of halogens, family of noble gas

2) Mendeleev's periodic law has been restated to say that when the elements are arranged in order of increasing atomic number, there is a periodic pattern in their chemical and physical properties.: this is true

3) Ramsey discover noble gases

4) technetium is man made element

5) The elements Be , Mg , Ca , Sr Ba, Ra belongs to alkaline earth metals

6) Atomic number is number of protons

7) an atom of oxygen has proton = 8 , neutron = 8 and electron = 8

8) This is not true

generally increases as atomic radius decreases within a group

9) Argon has most number of valence electrons

10) The valence electrons in carbon = 4

so there will be four valence electrons around carbon in lewis structure

11) There are five electrons in valence shell of nitrogen so if it will lose five electron it will achieve duet not octet

12) The sulphur atom has six electrons in outermost shell so it will lose six electron achieve

It's in the cards discovering the periodic law lab answers

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