Question

John Newlands was a chemist who worked in a sugar factory.

In 1866 he designed a periodic table.
He arranged the elements in order of their relative atomic masses.
He found a repeating pattern for some of the elements.
Newlands wrote, 'the eighth element starting from a given one, is a kind of repetition of the
first, like the eighth note in an octave of music'.
1.
H
2......
F
CI
Co, Ni
Br
1
Pd
Pt, Ir
Li
Na
K
Cu
Rb
Ag
Cs
TI
G
Mg
Ca
Zn
Sr
Cd
Ba, V
Bo
Pb
Al
Cr
Y
Ce, La
U
Ta
с
Th
Si
Ti
In
Zr
Sn
Hg
Newlands' periodic table
W
N
P
Mn
As
Di, Mo
Sb
Nb
Bi
O
S
Fe
Se
Ro, Ru
Te
Au
(a)
In Newlands' periodic table, the elements lithium, sodium and potassium are
grouped together.
Os
Give two properties of these elements which support the idea that they should be
grouped together.

Answer 1

1. Lithium, sodium, and potassium are all alkali metals with low densities, low melting points, and high reactivity.

2. They all have one valence electron in their outermost shell and tend to lose it during chemical reactions.

Step-by-step explanation: