Question

was the most important contributor to the early development
Periodie Table of elements in which the elements were arranged on the has
atomie mass and also on the similarity of chemical properties,
17.1 The three triads identified by Dobereiner are
(a) N, P, As) He, Ne, Ari Ca, Sr, Ba
(b) Li, Na, K, N, P, As) CI, Br, I
() N, P, As) Ca, Sr, ba, ci, Br, I
d) Be, Mg, Ca, N, P, As, CI, Br, 1
17.2 Which of the following statements is incorrect about the table prop
by Newlands? (a) it was applicable only upto calcium.
(b) it worked well with heavier elements only.
(e) it became irrelevant for noble gases.
(d) it was not applicable for only 56 elements existed at that time
17.3 The two pairs of elements placed in one slot by Newlands are
(a) Co, Ni and Ce, La
(b) Be, Mg and Co, NI
(e) F, Cl and Ce, La
(a) Zn, Sr and Be, Mg
17.4 The drawbacks of Mendeleev's Periodic Table were ren​

Answer 1

Answer:

The English chemist John Newlands (1838–1898), hypothesizing that the chemistry of the elements might be related to their masses, arranged the known elements in order of increasing atomic mass and discovered that every seventh element had similar properties

Explanation:

if you like it please mark me as brainliest